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Six on Saturday: Pots

Pots are a bit more common within our landscapes than they should be, but they can be justified.

1. Philodendron selloum ‘Lickety Split’ split-leaf philodendron grew efficiently enough to obscure its pretty green pot within a few months, but does not seem to grow much now. It seems to merely replace old foliage with new foliage. The stems do not elongate much.

2. Dianella caerulea, blueberry lily is named Sigmund because it looks like a shabby sea monster. It is in a large terracotta pot that it now completely obscures. It visually softens the blunt end of a low stone retaining wall that separates a few stone steps from a ramp.

3. Cymbidium, orchid with a few small bits of Vinca minor ‘Alba Variegata’, small white variegated periwinkle are in a cheap plastic urn, with Sigmund in the background to the left. I know neither the species nor the cultivar of the orchid, but it blooms white nicely.

4. Alocasia odora, taro, or whatever species this is, has grown quite nicely to obscure its pot, just like the split-leaf philodendron and Sigmund. It was taken from a vacated home with an Australian tree fern two years ago. Sadly, the old home will soon be demolished.

5. Brugmansia, angel’s trumpet really is getting to be redundant, but is also really quite pretty. Like the orchid, both its species and cultivar are unknown. I grew it from a scrap from a green waste pile in East San Jose. Its big terracotta urn was a gift a few years ago.

6. Eucalyptus globulus ‘Compacta’, dwarf blue gum is certainly not a typical houseplant. Yet, here it is within an antique coffee shoppe lounge at work. We do not know how long it can survive here without direct sunlight, but will eventually find out. It is quite grand.

This is the link for Six on Saturday, for anyone else who would like to participate: https://thepropagatorblog.wordpress.com/2017/09/18/six-on-saturday-a-participant-guide/

Posted on by tonytomeo · 13 Comments

Ponytail Palm

In its native ecosystem, ponytail palm grows as a small tree.

Some succulent plants and their friends do not mind being grown as houseplants. Ponytail palm, Beaucarnea recurvata, is one of those rare friends of succulents that actually prefers to be inside, at least during winter when they can be damaged by cool weather and moisture. Plants that are houseplants through winter and get moved out to the garden through summer should be protected from harsh direct exposure since their foliage is adapted to the home environment. Otherwise, ponytail palm likes the sunniest rooms in the house.

The weird distended caudex at the base of the stem is the most distinctive feature of the ponytail palm, which as actually neither a palm, nor outfitted with ponytails. However, almost like a palm, pruning a solitary top down will likely be fatal. (Pruning the terminal bud off the top of a palm will necessarily be fatal to the affected trunk.) Unlike (solitary) palms, ponytail palm can eventually develop multiple trunks, which can be pruned off if absolutely necessary.

In their natural environment, ponytail palms can get to be shade trees with sparse limbs terminating with tufts of narrow strap shaped leaves. Yet, as slowly growing houseplants confined to containers, they rarely get more than six feet tall after many years. They really need good drainage, and prefer to be watered only about twice to four times monthly.

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Potted Plants Need Work Too

Most potted plants would prefer to be in the ground, . . . if possible.

Potted plants can be a problem any time of the year. Some want more water than get. Most get too much water or do not drain adequately. Large plants get constricted roots if pots are too small. The roots of some plants get cooked in exposed pots that collect too much heat from sunlight. Besides, too many pots just seem to be in the way in otherwise useful spaces on decks, patios and anywhere else trendsetting landscape designers want to put them.

Now that the weather is getting cool and rainy, potted plants are not as active as they were during warm weather. Many are dormant. Although few demand the attention that they got during warmer weather, plants still need to be tended to appropriately through autumn and winter.

Cool season annuals, which are also known as ‘winter’ annuals, should get groomed as long as they are performing in the garden, just like warm season annuals get groomed through summer. Deteriorating flowers should be plucked from pansy, viola, primrose, Iceland poppy, calendula, dianthus, stock, chrysanthemum and cyclamen because they can mildew and spread mildew to developing flowers and foliage. Unplucked cyclamen and calendula can develop seed which diverts resources from bloom.

Pots that are out in exposed areas will not need to be watered while they get enough water from rain. The problem is that many that do not drain adequately can get too much water from rain and stay saturated. Dormant and defoliated plants do not need much moisture at all. Even evergreen plants do not need as much as they do while active during warm weather, because cool and humid weather inhibits evapotranspiration (evaporation from foliar surfaces).

Potted plants under eaves also need less water while the weather is cool and humid, but need to be watered nonetheless because they are sheltered from rain. Plants in hanging pots typically drain and dry more efficiently, so probably want a bit more water. Even a few sheltered small plants in the ground may occasionally want to be watered during rainy weather if they do not extend enough roots where they can get moisture from rain beyond the sheltered area. Sheltered plants are actually the most likely to be neglected because watering does not seem so important when it is raining.

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Do Not Forget Potted Plants

30918thumbAside from all the seasonal raking and dormant pruning, there is not as much to do in the garden as there was earlier in the year. Lawns do not need much mowing. Hedges do not need much shearing. Untimely mowing and shearing can actually damage lawns and hedges. Watering, which was so important while the weather was warm, is now rare in the cool weather between rain.

Watering is now so infrequent that the few plants that still need it sometimes do without. Plants that are merely sheltered by eaves probably do not mind so much because their roots are dispersed beyond the eaves. However, potted plants that are sheltered by eaves do not have that option. It may take a while in the cool and damp air, but they can slowly get uncomfortably dry.

Watering sheltered potted plants is too easy to forget about while everything that is not sheltered is getting soaked by rain. It is even more easy to forget because it is so infrequent. Things just do not dry out like they do in summer. Also, plants are less active, and many are dormant and defoliated, so really do not lose much moisture to evapotranspiration (evaporation from foliar surfaces.)

In fact, overzealous watering can be just as detrimental as neglect. Soil saturation may not be as immediately dangerous as it would be during warmer weather, but eventually kills roots. Even with adequate drainage, soil moisture can linger if plants do not consume it. Determining how much water is needed for sheltered potted plants may not be as simple as it should be.

Larger plants in smaller pots want more water than smaller plants in larger pots. Those that are exposed to wind will get dry faster than those that are protected. Hanging pots dry out the fastest. Ironically, drought tolerant plants that need the least water in the ground often want the most in pots. They are the most reliant on extensive root dispersion, which is not possible in confinement.

Some potted (frost tolerant) plants might get slightly relocated out into the weather so that they get the rain that keeps the rest of the garden well watered through winter.

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‘Silver Falls’ Dichondra

80124No one seems to know what ever happened to old fashioned dichondra lawns. Everyone seemed to like them, especially those of us who dislike turf grasses. Somehow, they became passe and very rare. The formerly common dichondra that such lawns were made of is now merely a resilient weed in turf lawns. But wait! We have not heard the last of this resilient and appealing perennial.

Silver Falls dichondra, Dichondra argentea ‘Silver Falls’, has the same tiny rounded leaves, dense growth and fine texture as old fashioned dichondra lawns, but instead of rich deep green, it is strikingly silvery gray. It does not tolerate traffic well enough to work as lawn, but is a distinctive small scale groundcover, and cascades exquisitely from urns of mixed perennials or hanging pots.

The trailing growth spreads indefinitely over the surface of the soil, but is not very fast about it. As ground cover, individual plants should therefore be planted only two or three feet apart. They get two to four inches deep. Hanging growth (that can not root into the soil) can cascade more than three feet downward. Silver Falls dichondra prefers regular watering and full sun or a bit of shade.

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Sweet Pea Shrub

70111It may not always bloom profusely, but sweet pea shrub, Polygala fruticosa, blooms sporadically through most of the year. Even when not much color is evident from a distance, a few flowers can likely be found on closer inspection. For some reason, bloom seems to be quite colorful now. Bloom phases should be more profuse in spring and summer. The pea flowers are soft purplish pink.

Mature plants might only get to two or three feet tall and wide, but have the potential to get larger. They are usually a bit wider than tall, with a nice rounded compact form. The evergreen foliage is slightly grayish light green. Sweet pea shrub prefers full sun exposure, but can get roasted in hot spots. A bit of shade should not be a problem. Once established, it does not need too much water.