. The American florist : a weekly journal for the trade. Floriculture; Florists. 162 The American Florist. Feb. 2Y, the plants, one that would eliminate the element of uncertainty as to strength of solution. It was at this stage that Cookson published his formula in the Orchid Review, and he stated that by its use on plants separated by its use merely —otherwise on the same bench—he could easily pick out the ones his gardeifer had applied it to, and in the light of our expe- rience this is easily believed. The formula Cookson recommends is three ounces of nitrate of potassium, two ounces of am
. The American florist : a weekly journal for the trade. Floriculture; Florists. 162 The American Florist. Feb. 2Y, the plants, one that would eliminate the element of uncertainty as to strength of solution. It was at this stage that Cookson published his formula in the Orchid Review, and he stated that by its use on plants separated by its use merely —otherwise on the same bench—he could easily pick out the ones his gardeifer had applied it to, and in the light of our expe- rience this is easily believed. The formula Cookson recommends is three ounces of nitrate of potassium, two ounces of ammonium phosphate by in three gallons of water. One liquid ounce of this solution is used to each gallon of water applied to the {.lants. In practice this is worked out by filling large tanks with water and dissolving the chemicals therein, using pounds instead of ounces, then attaching a pump to the faucet and watering with hose in the usual way. This is only in summer, for in winter odontoglossums are in need of little water and they are watered when dry with the watering can about once a week during the mid- winter months. The intention is to keep the plants on the dry side always and this brings me to the consideration of another essential feature in the suc- cessful culture of the plants. Some time ago in the Orchid Review we were told by a collector who had resided in the famous Paclio district of Bogota for the purpose of collecting large quantities of odontoglossums to be naturalized under similar climatic condi- tions in Jamaica, that he had experi- enced dry periods there of as long dura- tion as four months, and he had noticed the plants became shrivelled and dried to such an extent during the drouth that one would hardly expect them to survive the ordeal. Probably in our greenhouses they would not recover, but it gave us a clue to a radical change of treatment that was tried first in a tentative way and then adopted wholly, with surpris- ing resu
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