We have tree collard cuttings seasonally and have some coming in now. (they can’t grow from seed) We offer them in sets of three cuttings. Each cutting has several nodes from which leaves or roots will sprout. Cuttings should be put in pots in good potting soil and kept moist and in the shade to develop roots for a couple of months before planting out in the garden. Tree Collards are much like regular collard greens except that they are 5-6 feet tall with purple-tinted leaves growing up a single tall stalk. They are perennial in zones 8-9. In other zones, cuttings may be taken as winter begins and rooted indoors for planting out the following spring. Their history and biological identity seem to be shrouded in mystery, but they are reputed to come from Africa and have been preserved and passed on within African-American communities in this country. They do not normally flower or make seed, and when they do, the seed does not breed true. Instead propagation is by cuttings, which are passed along from gardener to gardener. Tree collard greens are tender and delicious in cool weather, so they are a good choice for a low-maintenance winter vegetable in mild climates. (They're pretty good in warm weather also.) We've grown these wonderful plants in our research gardens for decades. You'll receive three cuttings and instructions for rooting them; they'll be sent via first-class mail and should be placed in soil or water as soon as they arrive. If you order other items, these may come separately, (Sorry, we cannot ship these to foreign addresses.) Collard leaves are rich in calcium (226 mg per cup, cooked), vitamins B1, B2, B9, and C (which may be leached by cooking, however), as well as beta-carotene (pro-vitamin A). They are high in soluble fiber and contain multiple nutrients with potent anti-cancer properties: diindolylmethane, sulforaphane and selenium. Researchers at the University of California at Berkeley have recently discovered that 3,3'-Diindolylmethane in Brassica vegetables such as collard greens is a potent modulator of the innate immune response system with potent anti-viral, anti-bacterial and anti-cancer activity.