Orchid Culture - Motes Notes
Monthly advice for orchid growers in South Florida. There's lots of information pertinent to North Florida growers too. Subscribe to the monthly newsletter so it will be delivered to you via email each month.
by Dr. Martin Motes, from his monthly newsletter and book Florida Orchid Growing
Progress of the Season
This October has been exceptionally wet, more like September. This extension of the rainy season into the latter part of October may well be a reflection of climate change which will require us to think about our cultural practices going into the Fall each year. In any case, this wet October has allowed disease pressures to continue to increase when they should be waning. Care with watering is always good practice but especially important now that days are much shorter and sunlight less vibrant. Only water when absolutely necessary for vandas and other monopodial and rarely or never for most sympodial genera. A good period of drought will serve our plants well and put an end to disease pressure. An additional application of the fungicides recommended in Florida Orchid Growing is advisable even at this late date under the circumstances.
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All those hours of rain largely washed away mites and thrips, so an early application of the recommend oil to control these pests will not be required for a few weeks and is best put off until the first definitive cold front has past, lowering both temperatures and relative humidity.
Snails, on the other hand, have been reveling in the rain and have crossed vast distances to arrive at our orchid plants. To reiterate once more apply snail bait lightly, one or two pellets per square foot and repeat in 10-12 days. As a measure of how little bait is required, a 10 lb. bag lasts over 2 years in our acre of nursery. Two applications should wipe out your resident population and the upcoming dry weather will prevent your neighbor’s snails from establishing a new front in your plants.
While the rainy season with its accompanying warmth lingers, cold can still arrive with a swiftness that can take us by surprise. In this age of Covid-19 when so many of us are not venturing out to stores, the lead time for mail ordering any winterizing supplies needs to be reckoned on this year.
Like many others, I am “Digging for Victory” over the virus. Now is a great time to discover how wonderfully vegetables grow here in S. Florida, any other than temperate zone perennials can be planted now. It’s another great reason to be outside in our wonderful climate.
January is somewhat like December but in reverse, with each succeeding day bringing longer hours of sunlight until days are long enough that afternoons return at the end of the month with extra sunshine to warm us after the extra sharp cold snaps. January, like December, is cold and dry, in fact even colder and drier. Dry is good, cold can be very bad. We need to accentuate the positive by especially... read entire article
Despite the bloom on the avocados and the burgeoning new leaves on the live oaks, February is not spring in South Florida. Danger of freeze continues past mid month and frost can occur still into March. Even if the weather is balmy, it's too early to let down our guard or take down any protection we have mounted against the cold. The trend however is toward the positive as each lengthening day brings extra hours of warming sunshine... read entire article
Whilst March never comes in like a lion in South Florida, occasionally it slinks in like a bob cat. Frost is not unheard of in the first few days of the month. The more cold sensitive genera, hard cane dendrobiums, phalaenopsis and vandas may well need some protection even into the middle of the month. Overall, however, March brings us some of the most ideal orchid growing conditions... read entire article
Far from the cruelest, April is the kindest month to South Florida orchid growers. The weather in April is definitely settled into warm, even deliciously hot, with passing cold fronts only adding the delight of a pleasant change in temperature. The clean, bright days brimming with abundant sunlight and the low relative humidity create the high drying potential that orchids love... read entire article
May is a month of transition in South Florida. Early in the month we can expect the driest weather of the year. Because of the clarity of the air and lack of cloud cover, temperatures rise rapidly in the late morning and can reach the upper eighties or nineties by mid afternoon before cooling substantially in late afternoon. Fortunately, over night radiant cooling rapidly dissipates the previous day's... read entire article
June is the most dramatically tropical month in South Florida. As the southeast Trade Winds blow cool moist air off the Gulf Stream daily, as surely the heating effect of the center of the peninsula percolates up massive thunder heads. The increased cloud cover drawing a veil across the afternoon sun provides much cooling relief for our plants... read entire article
Although it mostly passes unnoticed to millions locked in their air-conditioned bubbles, July in South Florida is quite different from June. While the pattern of afternoon showers built from the moisture of the morning's sea breeze persists in July, the thunder-storms are sharper and shorter. The clouds linger less and the foliage dries more quickly. Less quantity of rain falls in July than in June... read entire article
July and August are the two most similar months in South Florida. Most of the advice on watering, disease and pest control in last month's calendar still apply but subtle changes are taking place. Although it may not seem so, as temperatures climb into the low nineties most afternoons, summer is in retreat: each day a little shorter, each night a little longer. With shorter days the importance of watering as early... read entire article
September looms as the only truly dismal month in South Florida. Even without the prospect of the unspeakable 'H' word, September disheartens since it is easily the dampest, dullest month in the year. Although more inches of rain fall in June, more hours of rain occur in the often slow, seemingly endless drizzles of September. Frequently a day or two can pass without so much as a solid hour of truly bright... read entire article
October is a month of change in South Florida. If the Romans had lived here where
we do, they would have named this month for their two faced god Janus. Usually
around the middle of the month, and certainly by the end of the month, the first strong
cold front pushes into South Florida bringing to a close the monolithic heat and damp
of summer and ushering in weather as most of the continent knows it, alternating
periods of warmer and cooler... continue reading
In November we can no longer afford to be dominated by the illusion, so easy here at the northern edge of the tropics, that summer will never end. Although Indian Summer persists for the whole winter in South Florida, November is the month to prepare our plants for those short sharp blasts of cold which are inevitably coming as each successive cold front pushes the overall temperature a little lower... read entire article
December marks the beginning of the serious dry season in South Florida. While this additional dryness provides relief from the autumnal rains that can bring so many fungal problems, December is also the month of shortest day lengths. This contracted period of light, on the contrary, reduces severely the drying potential for our plants. Nature thus both gives and takes away from us in December. We must... read entire article