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acid African violet algae amount animals anthers aphids bacteria become beetles branches bulbs called carbon dioxide chemical chlorophyll chromosomes colchicine color corms covered crop culture develop disease drought dwarf embryo epiphytes evergreens fern fertilizer Figure flower buds flowering plants foliage forests fruit fungi fungus gene germinate grafting grass green growing season grown growth homozygous hormone hybrid inches insects kill layer leaf leaves light lily minerals moist mosses night temperature nitrogen nutrients orchids organisms ovary oxygen parent period petals pine pistil pollen produce recessive gene regions removed respiration root hairs rose rotenone seed seedlings sepals sex cells shade snapdragons soil solution species sperm spores spray spring spruce stamens stem stigma stomata sugar surface survive sweet peas tall thrips tion tissue transplanting trees and shrubs TtRr tubers U.S. Department upper varieties week April wilt winter yellow