Prince's Feather The A.tricolor , Joseph's Coat or Summer Poinsettia, is an edible vegetable commonly known as Chinese Spinach. This plant will grow from 3 to 6 feet, but is usually cut back to encourage branching and delay flowering. The flowers are insignificant and the plant is better known for its colorful, richly variegated foliage. Amaranth is easily grown from seed. Start them in 3-inch pots.
Amaranths are difficult to transplant except when the seedlings are very small.
In late May or early June, after all danger of frost is past, they may be planted outside. Plant 18 to 20 inches apart, in well-drained soil and full sun. Seeds may also be sown directly outside, on the soil surface, as soon as the soil warms up in late May or early June. They will germinate in about 10-15 days. The first flowers start forming in June while the plants are still small and will bloom from July until frost.