Anatomically Correct Horticulture

P71026Certain fruits and vegetables were so much more palatable before studying botany. Knowing what they really are sort of puts a damper on things.

Real fruits, including those known as vegetables, are no problem. We all know what they are, and they have the seeds to prove it. Just like flowers reward pollinators with nectar, many plants use fruit to get animals and people to disperse their seeds. Therefore, the fruit is designed to be eaten.

The majority of vegetables are fine too. It seems natural to eat leaves, stems, roots and even flowers. Things get a bit weird with petioles of rhubarb, celery and cardoon, since the leaves are not eaten. Cinnamon bark and saffron stamens also seems a bit odd. What about maple syrup? Is it a vegetable too?

Then there are fruits and vegetables that are not what we think they are.

You will never look at a potato the same way knowing that it is a subterranean stem known as a stolon. If it is looking back at you, it is because it has eyes, which are actually modified axillary buds, which only stems are equipped with. It it were a modified tuber or or a tuberous root like most of us think it is, it would not have these eyes.

Pineapple might be watching too, with its many eyes. Each eye actually represents a flower. What we think of as a pineapple fruit is actually a densely crowded collection of distended and fused flowers. Does that mean it is a vegetable like broccoli or cauliflower?

Strawberry is sort of fruity; but only what we think of as strawberry ‘seeds’. They are actually single seeded fruits known as ‘achenes’. Really, those little black things are outfitted with everything that they need to be classified as fruit. The red part of the strawberry is only a ‘receptacle’ for the achenes.

Everyone knows that fig trees do not bloom. So, how do they make fruit? Well, they technically don’t make any visible fruit; but they do bloom. What we think of as a fig fruit is actually a weird inside out inflorescence, with minute flowers on the inside. Each species of fig is pollinated by a particular species of minute wasp that enters the inflorescence through a very small hole at the end. Minute achenes about the size of strawberry achenes are the crunchy bits in ripe figs. To make figs even more unappealing, some wild figs contain the eggs and larvae of the wasps that went inside to deposit their eggs before dying there. Yum. Most garden varieties attract the wasps, but lack the necessary floral parts for the wasp to want to leave their eggs there. They therefore do the job of pollinating without dying inside.

Butterfly

P71022Before you send me a comment about it, I am already aware that this is a very bad picture. It was taken with my primitive telephone because it was convenient at the time. This tired looking butterfly might not have waited for me to get the camera. It passed away, seemingly peacefully, right there on the hood of the old Chevrolet. It did not seem to be injured in any way. It probably simply expired like butterflies do after breeding. It is a natural process that the butterfly did not seem to be too distressed about. It gets no obituary because I am not qualified to write one. We are not sufficiently acquainted. I do not even know the specie of this butterfly.

Now that he or she is deceased, I ponder the beauty of these insects. They are so graceful and very colorful. They flutter about like animated flowers. Everyone likes them. Some of us grow flowers that attract them to the garden, and plants to sustain their baby caterpillars.

All flowers are designed to appeal to their pollinators of choice. Those that are pollinated by wind lack color, fragrance and other bling, but are very abundant. Those that are pollinated by flies smell like what flies like. Those that want to attract nocturnal pollinators are fragrant, luminescent (with ultraviolet patterns that are invisible to us), and open at night. Bee pollinated flowers use infrared patterns, and lots of other colors that bees like, and reward them with nectar and superfluous pollen. Well, you get the point. Floral structure, size, patterns, color, fragrance and schedule are all designed around pollinators.

It is difficult to say what butterflies like. They visit such a variety of flowers. Some have abundant pollen. Others have a bit nectar. Some are tiny flowers in dense groups. Others are larger composite (daisy-like) flowers. Butterflies can see both infrared and ultraviolet color, so it is hard to know what they see in flowers.

Some of the clustered small flowers that butterflies like are alyssum, fennel, goldenrod, phlox, Queen Anne’s lace, verbena, yarrow and of course, butterfly bush. They also like flower of the mint family, such as bee balm, lavender, oregano, rosemary and the various sages. Their favorite composite flowers include aster, calendula, cosmos, marigold, coneflower, zinnia and all the daisies and sunflowers.

Lavender Starflower

71101It is really an evergreen shrub with limber stems; but lavender starflower, Grewia caffra, can work almost like a rambling vine. It does not actually climb or grip anything. Like the canes of a climbing rose, it can be tied onto a trellis or fence as an espalier. As a free standing shrub, the arching stems should be pruned selectively. Shearing deprives them of their natural form, and inhibits bloom.

Espaliered plants can reach the eaves. Free standing shrubs have the potential to get as high and wide, but take more time. Alternatively, lavender starflower can be trained as a small patio tree. The leaves look like elm leaves, with the same sandy texture. The lavender star-shaped flowers are as wide as a quarter. They are not abundant, but they bloom as long as the weather is warm. Lavender starflower does as well with full sun as it does in partial shade.

Gutters And Chimneys Need Attention

71101thumbThere is no time that is best to clean the gutters on the eaves. They should probably be cleaned early before the debris within them gets dampened by the first rains. However, they will only need to be cleaned out again after more foliage falls. If cleaned only after all the foliage falls, they will be grungier, and there will be potential for some of the debris to flow into and clog the downspouts.

Most of the fresh leafy debris that fell recently is relatively easy to clean out. Debris that has been accumulating through the year will be more decomposed and settled in. Evergreen trees are somehow messier than deciduous trees. They drop smaller volumes of debris in autumn, but they drop the rest throughout the year. Deciduous trees drop all their foliage within a limited season.

That certainly does not mean that deciduous trees can not make a mess. All that foliage has to go somewhere. If the weather gets cool slowly, foliage falls slowly, and for a longer time. Some deciduous trees innately defoliate slowly, and may even wait all winter to finish. Fruitless mulberry, tulip tree and poplars typically defoliate efficiently, making a big mess that gets cleaned up once.

Flat roofs that lack gutters collect debris too. So do the spaces behind chimneys and in roof valleys (where the slope changes direction). Even if this debris does not interfere with the function of gutters and downspouts, it promotes rot in roofing material. Trees and vines that touch a roof are likely to be abrasive to roofing material if they move in the breeze, or hold debris against the roof.

Trees and vines must be kept clear of chimneys, not only because they can interfere with ventilation, but also because they can be cooked by exhaust from the fireplace below, and ignite! Fan palm beards (dead foliage that accumulates on trunks), pine, cypress, spruce and cedar are particularly combustible. Clinging vines can separate brick from mortar, which is another fire hazard.

Working on the roof and gutters is of course potentially dangerous. It might be best to get a professional for these sorts of jobs, especially if trees need to be pruned. While that is being done, there is plenty of raking and other gardening for us to do (without a ladder). Raking leaves is an important job too, since fallen leaves can shade out lawn, ground-cover and flowering annuals.

Yuccas (reblogged)

 

P71022+Yuccas are almost as useful as aloes are for gardening in chaparral or desert climates. I say ‘almost’ because most are not quite as friendly. The leaves are outfitted with nastily sharp tips. It is how they protect themselves from grazing animals in the wild, but it is not such an advantage in home gardens. Some actually have the potential to be dangerous where someone could bump into them. The leaves of Joshua tree can puncture leather. Some types of yucca get so big that they make it difficult to avoid their nasty leaves, even if planted in the background.

That being said, for those of us who do not need to worry about endangering children, dogs or anyone else out in our gardens, yuccas are very distinctive and handsome plants. Their striking foliage radiates outward from dense foliar rosettes. Large spikes of creamy white flowers that bloom in summer or autumn stand above the foliage quite boldly. Some yuccas produce remarkably tall floral spikes. Our Lord’s Candle, Yucca whipplei (Hesperoyucca whipplei), is a terrestrial yucca that sits low to the ground, but produces a huge flower stalk that stands ten feet tall! Modern garden varieties of Adam’s needle, Yucca filamentosa, are variegated.

Of the yuccas that develop sculptural trunks, only a few are available in nurseries. The giant yucca, Yucca elephantipes, is almost too common in mild climates, and unfortunately develops a massively distended trunk that is too big for some of the situations it gets into. Most other trunk forming yuccas that grow slower are uncommon because they are susceptible to rot in landscapes where they get watered through summer.

Except for a few tropical yuccas that are very rare, yuccas are very drought tolerant. Even in desert climates, some yuccas survive on annual rainfall. Others are happier if watered a few times through summer. Giant yucca happens to be a tropical yucca, but surprisingly does not need much water.

Giant yucca is very easy to propagate from cuttings of the big canes. Even big pieces can be cut and stuck as cuttings. However, most of the tree yuccas are difficult to propagate.

Terrestrial yuccas that do not develop trunks are generally easy to propagate by division of pups, although some are difficult to handle. Some terrestrial yuccas actually develop small trunks that creep along the ground, or maybe stand a few feet tall. They can be propagated as cuttings like giant yucca.

P71021

Aloes (and a Rant)

P71020We really should be growing more of what grows well here. This is as relevant in other regions as it is in the Santa Clara Valley. Some regions have a lot more to choose from. There are always limitations too. Tropical plants do not survive the winters of New England. Apples and pears want more winter chill than they can get in San Diego.

In California, we do not have enough water to go around. Well, that is not completely true. Much of that misconception is political, which is none of my business. Much of it is that there are just too many people living here and sharing a limited resource. Much of it is that many of the too many people living here waste water on, among other things, gardening.

Many of the urban areas of California are in chaparral climates, which means that there is not much rain. Los Angeles and some other urban areas are full blown desert, which means that rain is quite minimal. My former neighborhood in the western Santa Clara Valley got about a foot of rainfall annually. It was considered to be chaparral. Trona, in the Mojave Desert, gets about four inches of rain annually.

However, few people in chaparral or desert regions landscape their homes accordingly. Some limit their ornamental plants to natives. Others limit their choices to plants from chaparral or desert climates, even if not native. Yet, most of us grow plants and lawns that really have no business in chaparrals or deserts, and we do so excessively.

Well, enough of that rant. There are many plants that really should be more popular here.

Aloes are a perfect example. Although many are from more tropical climates, most do not need to be watered too much. Some prefer minimal watering through summer. After winter rains, they produce fresh new succulent foliage in spring, and bloom reliably. Many have flashy orange or yellow flowers on striking vertical spikes. As plants grow, superfluous shoots can be separated and planted wherever more of the same plants are desired.

Smaller aloes are quite dense and mounding, with tight rosettes of stout leaves. Larger types with more open growth can get six feet tall. A few grow into small trees, with thick trunks that might be distended or buttressed at ground level. Leaves might have pronounced teeth along the margins, and most are spotted to some degree.

Everything about aloes is striking. They have prominent and colorful bloom. The distinctive succulent foliage is bold and unique. The larger aloes even have sculptural form.

Aloes are ideal for planters and pots because their roots are so complaisant and undemanding. They are rarely bothered by insects or disease. They are so easy to propagate that cuttings or pups can be acquired from friends or neighbors who are already growing them.

Rain!

P71020Something really crazy happened last night. From out of nowhere, a profusion of drops of water started to fall from the sky! It continued to fall for a while, and got everything wet. Soil that had been dry and dusty became rather muddy. As crazy as it sounds, it is not impossible, and actually happened repeatedly last autumn, winter, and into spring. In fact, it was so abundant that the San Lorenzo River filled with all this strange sky water, and flooded worse than it had since the flood of 1982! People in other less arid climates are more familiar with this sort of thing. It is actually no mystery. It is known simply as ‘rain’.

‘Rain’ is like free water. Really, we do not need to pay for it! It falls from the sky, and waters the garden so we don’t need to. It might be the only water that areas outside of the garden get. Some plants out there have been waiting for it since it stopped falling from the sky last spring. Rain that does not soak into the ground drains into creeks and rivers, which flow into reservoirs that store it for later use. (Local reservoirs don’t really save it for later use directly, but use it to recharge groundwater; but that is another story.)

Another advantage of rain is that it tends to get things wet, which makes them less combustible. This is rather useful when forests nearby are burning. The Bear Fire near Boulder Creek is not quite extinguished. In fact, it is not yet contained. This rain should help with that. It probably will not do much for what is already burning, but should slow the already stagnating progression of the fire.

White Trash

P71018Long before my white supremacy garden (https://tonytomeo.wordpress.com/2017/09/21/white-supremacy/), I noticed that some white flowers were inferior to their more colorful counterparts. Brent (to the left in the picture in that other article I just cited) is often pleased to remind me of it. Only a few flowers are at their best in white. I, of course, am pleased to remind Brent of them. Then, he reminds me that black flowers are very rare, as if that makes them special. I then remind him that most black and dark flowers are pollinated by flies, so must imitate the fragrances of what flies are attracted to.

Callas, lilies, gladiolus, camellias, oleanders and dahlias all excel in white. They are at least comparable to their more colorful varieties. White callas, gladiolus and oleanders are actually superior to those more colorful. Some but not all varieties of rose, hydrangea, wisteria and tall bearded iris are exquisite in white as well.

Then there are plants like bougainvilleas, crepe myrtles, geraniums and angel’s trumpets that are less impressive in white. Bougainvilleas and crape myrtles just are not quite as bright in white as they are in their vibrant pinks and reds. White geraniums and angel’s trumpets are relatively weak, and white geraniums do not drop faded flowers efficiently.

Many white flowers do not even try to impress. They throw their pollen to the wind and let it do the work. Color is for flashy flowers that want to attract pollinators. Pyracantha and photinia flowers, for example, are neither colorful nor big and flashy, but are very numerous. They are somewhat fragrant, just in case some sort of pollinators happen to be interested. Other wind pollinated flowers do not even offer that much.

Nocturnal flowers that rely on nocturnal pollinators might be big and fragrant, but are mostly insipid pale white. Some are slightly blushed with yellow or pink. They are not bright white only because they do not actually use the brightness of their white to get noticed. They instead use ultraviolet or infrared color that is invisible to us. Many of these seemingly bland flowers have rather flashy patterns of stripes, spots and blotches that are only visible to nocturnal animals and insects who can see ultraviolet or infrared light. Many flowers that are active during the day use this technique in conjunction with visible color (that we can see) as well. Regardless, it does nothing for us, since we can not see it.

Fire!

P71018Fire is part of life here. It is a risk that those of us who live in the Santa Cruz Mountains must accept. We live in forests full of abundant vegetation fuel, where fire crews and equipment have limited access. The horrible Tubbs Fire that recently burned an urban neighborhood in Santa Rosa demonstrates how destructive, risky and unpredictable fires can be. That neighborhood was in town, outside of forests, where fire is not such a commonly accepted risk.

This morning, October 17, on the anniversary of the Loma Prieta Earthquake, our community woke to a fire of our own. The sunrise looked more like a colorful sunset, with orange and tan smoke everywhere. The ash that had fallen from the sky made it seem like there had been a cremation party last night. It is getting to look like Pompeii around here. The fire started last night as a house fire near Bear Creek Road outside of Boulder Creek, and moved into more than a hundred acres of forest. Crews from as far away as San Jose responded quickly, and seem to be containing it. The region was evacuated, and Bear Creek Road was temporarily closed. The fire is only 5% contained as I write this before noon. Fortunately, the humidity is up, and the temperature is down.

Fire is more than a part of life for us. It is part of nature. Although almost all fires here are caused by human activity now, fires had been burning forests and wildlands long before humans arrived. There certainly were not as many fires, but without anyone here to suppress them, they burned much larger areas for much more time. A fire started by lightning early in summer could burn for hundreds of miles until extinguished by a storm the following autumn. A single such fire could easily burn more area than all unnatural fires now burn each year. There were likely several such fires annually. That is why old photographs show that California was historically not as densely forested as it is now. Forests simply burned more regularly.

Many plant species know how to work with fire. A few, such as the giant redwood and coastal redwood, survive fire by being relatively noncombustible. They only burn if other vegetation around them gets extremely hot. Most of the pines do not mind burning because their cones open to disperse seed after getting cooked by fire. The seed germinate quickly the following winter to reforest the area that was just cleared by fire. If they are fortunate, they grow up and dominate the forest before other vegetation does, only to burn again a few decades later.

Then there are a few plants that take this technique a step further. Monterey pine is innately sloppy. By that, I mean that it holds much of its old dead limbs instead of shedding them. Lower limbs collect significant volumes of fallen needles, instead of letting the needles fall to the forest floor. Consequently, when a Monterey pine forest burns, it gets hot enough to incinerate competing vegetation and its seeds. Monterey pine cones do not burn completely. They insulate the seeds within just long enough to survive the quick and hot fire, and then open afterward to disperse seed. This is a significant advantage to the Monterey pine, even though they get incinerated too. Not much more than their own seed survives to dominate the forest.

California fan palms (and the related Mexican fan palms) collect long and very combustible beards of dead fronds. When they burn, they likewise incinerate everything below them. The single terminal buds of the palm trees remain safely insulated inside their thick trunks, and will regenerate later as if nothing every happened.

This tactic sounds violent, but it works for the trees that use it. However, enhanced combustibility is not such an asset in home gardens. That is why it is so important to either plant combustible plants at a distance from homes and buildings, or to maintain them so that they are not allowed to collect fuel.

If palms are allowed to wear their beards long enough to reach the ground, other combustible plants should not be allowed to get too overgrown around them. Alternatively, palms can be allowed to wear long beards if the lower portions are pruned up and away from other combustible plants.

Just like there are several plants that are not notably combustible, there are some that are notably combustible. Pines, cypresses, firs, spruces, cedars, junipers, acacias and eucalypti, although useful and appealing in the right situations, all happen to be notably combustible.

Society Garlic

71025Some flowers are better left in the garden rather than cut and brought in. Society garlic, Tulbaghia violacea, looks like it would be an ideal cut flower, with nice bare stems. The aroma suggests otherwise. It smells something like a strongly aromatic combination of onion and garlic. Even in the garden, it might be a good idea to keep it at a distance. Deer and rabbits do not mess with it.

Society garlic is sometimes known as pink agapanthus because it has similar foliage and flowers, only much smaller. The tiny flowers are really more lavender pink than pink, and bloom in round clusters on stems about a foot and a half tall in late summer or early autumn. The narrow leaves are only about a quarter of an inch wide, almost grassy, but more rubbery like those of agapanthus.

Mature plants form dense clumps of foliage at least two feet wide. Variegated plants stay much smaller, but are also very likely to revert to green (non-variegated) growth, which if not removed, overwhelms and replaced variegated growth. Society garlic is very easy to divide for propagation. It likes full sun or slight shade. Although somewhat drought tolerant, it prefers regular watering.