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Gardening With Tony

Too Much (Or Little) Exposure Can Be A Problem
Posted by Tony Tomeo on May 22, 2012 - 5:52:23 PM

BEVERLY HILLS—How can so many colorful annuals and perennials be so surprisingly happy in the many large pots on the sidewalks in front of downtown shops? Downtown does not seem like it should be so comfortable to them, with all the concrete, glass, stucco and all sorts of other reflective surfaces to enhance the harsh exposure. Yet, the buildings and street trees instead provide a bit of shade to soften exposure and hold in a bit of ambient humidity. Some areas are even too dark for many plants.
Transvaal daisy
This Transvaal daisy may not actually behave like a perennial, since it will probably survive only a few months in a planter of rich media, but it will be flashy while it lasts.

Exposure is as important to selection of appropriate plants as climate and soil (or potting media) are. Plants that need full sun exposure will not perform like they should in partial shade. Those that want partial shade may get roasted by too much sunlight.

Walls, fences, and windows to the north can enhance the harshness of exposure by reflecting glare. To the south, they can conversely limit exposure with shade. Such structures to the west increase morning warmth but provide shelter from afternoon heat. To the east, these features are not so advantageous, since they shade morning sun, but enhance afternoon heat. Pavement adds to glare without providing any shade.

As if this is not confusing enough, there are many more factors to consider. Coarsely textured or darkly colored surfaces do not reflect glare as severely as smooth or lightly colored surfaces do. Broad eaves, like those that adorn classic ranch style architecture, not only add more shade, but also limit reflected glare from walls below. Taller buildings, like two story Victorian houses, create more shade than single story Spanish colonial houses with flat roofs. Even shade trees are variable, ranging from the dark evergreen shade of Southern magnolia, to the light deciduous (absent through winter) shade of silk tree.

Most plants do well within a significant range of exposure, between full sun and partial shade. A few, like agaves, yuccas, oleanders and most eucalyptus, are resilient to harsh exposure, but would not survive significant shade, and would look tired in even partial shade. Even fewer, like ferns, fuchsias, impatiens and Japanese aralia, tolerate darker shade (although none survive in complete shade), but would get roasted if too exposed. Shade, reflected glare, and anything that might affect exposure must be considered in the selection of appropriate plants for each particular application.

Flower of the week: Transvaal Daisy

After rose, carnation, chrysanthemum and tulip, the fifth most popular cut flower is the Transvaal daisy, which is also commonly known as the gerbera daisy, Gerbera hybrida. The composite (daisy-like) flowers are typically about three to four and a half inches wide, in bright shades of yellow, orange, red, pink and white, with dark centers. They stand several inches high on bare stems, adequately above the lower, coarsely textured foliage. Transvaal daisies can bloom well for a month or more as potted houseplants in sunny spots, but rarely survive more than two months indoors. If planted in a sunny but not too harshly exposed spot in the garden as they begin to deteriorate, they can sometimes recover and continue to bloom as short lived perennials. They need good drainage but uniform moisture in organically rich soil.



 

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Serving Bel Air, Benedict Canyon, Beverly Hills. Brentwood, Laurel Canyon, Los Feliz, Malibu, Pacific Palisades, Melrose, Santa Monica, Sherman Oaks, Studio City, Topanga, Canyon, Westwood & Hollywood Hills.