Leaves may begin to grow at first but then will stop until good roots are formed. Cuttings should be put in pots in good potting soil (with half of the nodes below the soil and half above) and kept moist and in the shade to develop roots for a couple of months before planting out in the garden. Each cutting has several nodes from which leaves or roots will sprout. We offer these in sets of three cuttings. If it says “out of stock” go ahead and order we are getting fresh cuttings in and mailing them out at the start of each week. 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. They are high in soluble fiber and contain multiple nutrients with potent anti-cancer properties: diindolylmethane, sulforaphane and selenium. 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). We’ve grown these wonderful plants in our research gardens for decades. (They’re pretty good in warm weather also.) 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. Instead propagation is by cuttings, which are passed along from gardener to gardener. They do not normally flower or make seed, and when they do, the seed does not breed true. 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. In colder zones, if you have established plants, you could try taking cuttings as winter begins and rooting them indoors for planting out the following spring. They are definitely perennial in zones 8-10, maybe in zone 7, and may over-winter in other areas depending on the conditions. 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. Bananas give you an idea of the size of the leaves.
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