When are the plants tied to stakes?

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CHSPE English-language Arts: Reading Practice Test - Passage 1 — practice the complete quiz, review flashcards, or try a random question.

Passage 1   Tomato plants should be started in window boxes or greenhouses in late March so that they will be ready for the garden after the last frost. Use a soil of equal parts of sand, peat moss and manure, and plant the seeds about a quarter of an inch deep. After covering, water them through a cloth to protect the soil and cover the box with a pane of glass. Keep the box in a warm place for a few days, then place it in a sunny window. After the second leaf makes its appearance on the seedling, transplant the plant to another box, placing the seedlings two inches apart. Another... Show more

When are the plants tied to stakes?