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Fast Plants Brassica rapa (broccoli, cabbage, turnips and cauliflowers are also brassicas). Days 1 - 3 The radicle (embryonic root) emerges. Seedlings emerge from the soil. Two cotyledons (seed leaves) appear and the hypocotyl (embryonic stem) extends upward. Days 4 - 9 Cotyledons (seed leaves) enlarge. True leaves appear and develop. Flower buds appear in the growing tip of the plant. Days 10 - 12 Stem elongates between the nodes (points of leaf attachment). Flower buds rise above the leaves. Leaves and flower buds continue to enlarge. Days 13 - 17 Flowers open. Floral parts can be identified. Flowers can be cross-pollinated (from one plant to another) for 3 – 4 days. Pollen is viable (potential to fertilize) for 4 – 5 days and stigmas remain receptive to pollen for 2 – 3 days after a flower opens. Days 18 - 22 Petals drop from the pollinated flowers. Pods elongate and swell. Development of the seed and young plant has begun and will continue until approximately Day 36. Days 23 - 38 Seeds mature and ripen. Lower leaves yellow and dry. Twenty days after final pollination plants should be removed from water. Day 38 – 45: Plants dry down and pods turn yellow. Day 45: Pods can be removed from dried plants. Seeds can be harvested. The cycle is complete.