Bougainvillea is profuse and vividly colorful.

No other bloom is comparable to that of bougainvillea. It is often profuse enough to nearly obscure the foliage. The color is remarkably vibrant. Magenta is the most popular color. Purple might be the second most popular color. Other cultivars bloom in delightfully rich hues of pink, red, orange, yellow and white. Some bloom with double flowers. A few dwarf cultivars have variegated foliage.

Bougainvillea is a thorny vine that leans on its support, rather than cling to it. Like climbing roses, it must be tied or woven into trellises. Larger cultivars can mix with the branches of trees and big shrubs to eventually reach more than thirty feet high. Many cultivars stay much lower. Some grow slowly, and do not get more than three feet tall. The lush foliage is evergreen with regular watering.

However, bougainvillea does not want too much water, and actually prefers to get a a bit dry between regular irrigation. Excessive irrigation may promote vegetative growth while inhibiting bloom. Excessive fertilizer does the same. Sunny and warm exposure promotes fuller bloom. In late spring, the first and most profuse of perhaps a few bloom phases can continue for more than a month.

Orange Clock Vine

It is time for orange flowers.

Since it rarely gets cold enough here to freeze the foliage and stems, clock vine, Thunbergia gregorii, provides very orange flowers throughout the year, and will bloom more profusely in summer. It is very similar to the more traditional black-eyed Susan vine, but the flowers lack the prominent black throats. Relative to most vines, orange clock vines is rather docile. The wiry vines are happy to climb to the height of first floor eaves, but do not go much farther. Without support, the vines grow as small scale ground cover.

New plants prefer full sun exposure, even if they later choose to spread into partial shade as they grow. Shade inhibits bloom. Once established, orange clock vine does not need much water, and can actually survive in abandoned landscapes. Overgrown or neglected vines can get weedy in spots, especially if not regularly watered. Fortunately, they are easily renovated by severe pruning at the end of winter. Even if pruned almost to the ground, vigorous vines regenerate very efficiently.

Chilean Jasmine

90814This is not just another mandevilla. Well, maybe it is. Mandevilla laxa is special though. It is known as Chilean jasmine because, unlike other mandevillas, it is so delightfully fragrant, particularly on warm summer evenings. Some say the fragrance is similar to that of gardenia, but not as strong. Others say it has a bit of vanilla mixed in. Sporadic bloom continues through most of summer.

The two inch long pure white flowers flare out to be a bit wider than long, and are a bit more relaxed than the neatly tailored flowers of other mandevillas. They bloom sequentially in small groups, with new flowers replacing the old for quite a while. The glossy rich green leaves can get almost twice as long at the flowers. Foliage last better on the coast, but is mostly deciduous elsewhere.

Chilean jasmine grows fast in spring, especially if pruned well after winter, but is surprisingly tame. It can grow past downstairs eaves, but should not reach upstairs eaves. It is satisfied with a light duty trellis. If carefully pruned out and removed each winter, it is one of the few vines that is complaisant enough for lattice. Light frost can kill stems to the ground, but they usually recover in spring.


60803‘Alice Dupont’ mandevilla that was so popular through the 1980’s was already a cool vigorous but not too overwhelming vine, with big clear pink radial flowers. It grows rather vigorously to upstairs eaves, and tends to get bunched where it reaches the top of its support. Modern cultivars with red, white or bright pink flowers are more compact and tame, and can stay below downstairs eaves.

The wiry twining stems neither root into their support like ivy does, not get bulky enough to constrict and crush their support like wisteria does. However, old vines might get thick enough to split lattice apart. New plants are greener in partial shade, although they will probably climb to where they get full sun exposure. The glossy evergreen foliage is surprisingly sensitive to even mild frost.

Mandevilla is tropical, so enjoys warmth, but not aridity (minimal humidity). Overly exposed foliage can get scorched by hot weather. Sporadic bloom continues from spring through autumn, with more prolific bloom phases in response to warm weather. Unfortunately, mealybug, aphid, scale and whitefly enjoy warm weather too. While pruning, the caustic white sap can be a toxic nuisance.

Red Trumpet Vine

60420Red trumpet vine, Distictis buccinatoria, is more green than red. The tubular orangish red flowers with yellow throats are pretty while weather is warm, but not too abundant. Slightly distressed plants tend to bloom more abundantly. Each evergreen compound leaf is a pair of leaflets with a sneaky central tendril that will grab onto anything while holdfast discs get a more permanent grip.

Vines tolerate significant shade, but will find their way to sunnier situations where they grow more aggressively. They can easily reach the roof of a two story house, and grow out of reach in trees. Their holdfast discs will damage paint, and even shingles! Overgrown plants can be cut to the ground and allowed to regenerate.

Red trumpet vine wants to be watered somewhat regularly while young. Mature plants can disperse their roots well enough to find water if they do not get it directly.

Cape Honeysuckle

51118It may not bloom profusely, but cape honeysuckle, Tecoma capensis, blooms sporadically at random times throughout the year, and often while not much else is blooming. The bright reddish orange flowers contrast nicely against glossy evergreen foliage. Some blooms are slightly more reddish, while others are slightly more orangeish. A somewhat more compact cultivar blooms with light yellow flowers.

The long and limber stems of cape honeysuckle can not decide if they want to grow as vines or as shrubbery. They can be tied back and espaliered against a fence or trellis, or pruned and left to stand on their own. Large plants can get higher than the eaves. Overgrown thickets of stems can be cut down to the ground at the end of winter. They can regenerate and resume blooming before summer.

The narrow tubular flowers are about two inches long. They develop in terminal trusses, but only a few within a truss bloom at the same time. Shade inhibits bloom. Fertilizer seems to inhibit bloom by promoting vigorous vegetative growth. Fortunately, these vigorous shoots eventually bloom as vigorously as the grew. The four or five inch long leaves are pinnately compound, with five to seven small serrate leaflets.

Carpet Rose

51028They compare to more traditional roses like instant coffee compares to real coffee. They are too easy and cheesy. However, even instant coffee can be rather good as long it is not expected to taste like the real thing. Likewise, carpet roses do not produce big and fancy flowers on long stems for cutting, but they have other attributes that are advantageous in the landscape.

The small but ridiculously abundant roses that started blooming late last spring are only now finishing. Bloom can be white, pink, red, coral, scarlet, gold (orangish yellow), yellow or white. The rich green foliage is remarkably resistant to disease, and lasts until frost. The arching stems can spread a few feet without getting much more than three feet tall. Most cultivars stay shorter. Some get quite wide.

Like other roses, carpet roses will need to be pruned back severely while dormant in late winter. Yet, they do not need to be pruned nearly as carefully. Because they grow as thickets of canes, they do not need to be thinned to only a few canes when pruned. Even if old canes do not get pruned out, they will get overwhelmed and replaced by newer canes naturally.

Six on Saturday: Not My Garden


My garden really is not much to talk about. Really. It is just a bunch of redwoods with a bit of other native vegetation dominating the few items that I added into the mix. There are fourteen stock fig trees, but they are very small and mostly obscured by the underbrush. The elderberries, currants and huckleberries are the same as what grows wild, so they do not look like much either. Even the cane berries look very similar to the native blackberries. There is a quince tree, some rhubarb, and some small prickly pear, but they are barely visible amongst the other vegetation. Well, that is enough talk about why my garden is not much to talk about.

These pictures are from one of the gardens that one of my colleagues maintains.

1. Hibiscus is probably the flashiest bloom in this garden now. I have no idea what cultivar this hibiscus is; and I am not even certain about the species. It sure is impressive though. This flower is more than six inches wide!P80901

2. Red honeysuckle is something that I really want to grow, but can not justify it. I mean, it does not exactly ‘do’ anything more than look good. It is not fragrant like Japanese honeysuckle is. This one took a while to bloom.P80901+

3. Zonal geranium happens to be one of my favorite perennials, even if others consider it to be too cheap and common. I do not know if this one is pink, peach, salmon . . . or one of those odd colors that only girls can see.P80901++

4. Mandevilla is my best guess. Again, I do not know the species. Did I mention that this is not my garden? I do happen to like this one though, because it is so perfectly white. Otherwise, I am none too keen on mandevilla.P80901+++

5. Morning glory is quite happy here. This one is annual of course. There was a perennial white morning glory known as a moonflower nearby, but it succumbed to frost last winter. Hope for its recovery ran out months ago.P80901++++

6. 4:00 (four o’clock) is a prolific naturalized exotic species. I would not say that it is invasive, but merely prolific. I do not know if this one is 4:00 a.m. or 4:00 p.m., but I do know it will not be the last. More on that later.P80901+++++

This is the link for Six on Saturday, for anyone else who would like to participate:



70621Pink, red or white are the only choices. There happens to be a darker shade of red. Yellow throats are more conspicuous in white flowers. Otherwise, there is not much variation of color amongst the various mandevillas. The flowers are very similar in both color and form to those of related oleander, but are larger. Some are as wide as three inches. Small flowers can have pointed petals.

Mandevilla vines are surprisingly vigorous and sneaky. The lower portion of a mature plant may seem to be rather tame while it extends aggressively twining vines into trees above. Vines on small trellises can get congested on top. Pruning upper growth helps to even out growth and bloom. Exposed vines are likely to get killed back by frost in winter, but should regenerate efficiently.

The evergreen foliage is quite glossy. Some varieties have interestingly rippled leaves. Partial shade is best for rich green foliar color. Full sun can scorch leaves. Dipladenias are very similar to mandevillas, but are shrubbier and more compact, with smaller flowers and leaves. They are probably a better option for large pots. Sap of both mandevillas and dipladenias is caustic and toxic.

Blue Dawn Flower

70614Even within its native range, blue dawn flower, Ipomoea indica, can be a problem. There are not many other plants in some coastal regions of Peru that can avoid getting overwhelmed by the aggressive wiry vines. These vines grow roots where they touch soil, so can spread indefinitely over the ground. Vines that succumb to frost over winter regenerate as if nothing ever happened.

Three inch wide flowers are rich purplish blue when they open at dawn. They then fade through the day, only to be replaced by fresh new flowers the following morning. Bloom continues from spring until autumn, and can get profuse at times. The lush rich green leaves are cordate (heart-shaped) or lobed (with only three lobes). Too much fertilizer promotes growth but inhibits bloom.

Blue dawn flower’s main weakness is a dependency on water. If it gets too dry briefly in summer, it can die back like it does with frost, and then recover once it gets water, but it will not survive for very long if it stays dry. As aggressive as it is, it should not spread very far from landscaped areas or riparian areas where summers are too warm and dry for it.