The four-season orchid cultivation mnemonic comes from "Lan Hui Tong Xin Lu" (A Record of the Shared Heart of Orchids and Huilan)

Xu Qilou's "Lan Hui Tong Xin Lu" "Cultivating Orchids and HuilanFour SeasonsMnemonic":
First month: It is spring breeze month again, the first month of the lunar calendar; take extra care when placing them in the warm room. Open the south-facing window wide and close it diligently at night, so the cold does not reach them by dawn.
Second month: Apricot blossoms and spring rain bustle at the branch tips; joyfully see the delicate fragrance gradually sprouting day by day. Under the eaves, avoid frost and guard against freezing; cherishing the flowers, one often worries about the night cold.
Third month: At Qingming season the rain falls like silk, soaking the moss marks as the buds grow. Guard against stuffiness by moving them to a bright, airy spot; near the eaves, still keep out the north wind.
Fourth month:Huilanhas finished blooming, and then comes clear warmth; gradually one feels the sun's harshness and what to do about the scorching. Arrange a flower-protecting curtain frame, for half shade is better than a bamboo grove nest.
Fifth month: Moldy rain continues for days, and the green stems grow long; on the old clump, sprouting shoots appear again. In this yin-yang weather, care for them carefully; do not let the fierce sun leak through the bamboo shed.
Sixth month: Heat soaks the central courtyard and does not fade; shade them with layered curtains in the morning and lift them only at night. Try to foster the buds for next year's flowering; be cautious and water with grass juice.
Seventh month: Cool wind first stirs while the heat still smolders; when the soil dries, take care to water diligently. Once they have gained vitality, the buds should emerge from the soil first; there is no need to fix the timing to the Autumn Equinox.
Eighth month: After the osmanthus steaming comes the fierce autumn sun; when things dry out, guard against damaging the roots. Remember when the water chestnut season brings dryness, a pot of clear water is like fine jade nectar.
Ninth month: Tree leaves are battered and frost secretly flies; let them take the night dew and slight wind. Only when the marks on the tiles thin out should they be placed under the south eaves to receive the dawn light.
Tenth month: Ridge plum blossoms suddenly open as the little spring returns, yet one fears warm mildness may bring frost and snow. Move them to the thatched hall to welcome the crisp air; set them high in earthenware pots with the small window open.
Eleventh month: The cold moon of Guanghan brings midwinter; heaven and earth are ruthless, how can the freezing be endured? Open the window at midday and close it again in the afternoon; protect them all around and weave more thatch.
Twelfth month: During the nine-nine cold period, guard against the freeze not breaking; with the window sealed, one fears even more that snow will fly in. If it reaches the point where dripping water turns to ice, furnace fire can call spring back.