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Thai plantsThai plants : Crown of Thorns is a slow growing plant, so cuttings are usually shipped either bare root, or callused. Many firms are shipping rooted cuttings with dry roots; this is not usually a problem as new roots form quickly. Rooting takes from 14-21 days; bottom heat is best but not essential during rooting. Once cuttings are rooted, most cultivars begin flowering immediately, so for quick turnover, try three cuttings of smaller cultivars in a 4- to 5- inch pot, one cutting per pot on the larger cultivars. Deeper plant liners will help keep stems upright until the root system gets established. Crop time varies with the type of cutting or liner you begin with: in 4-inch pots, it takes roughly 12-14 weeks (similar to kalanchoe); larger pots, such as 1-gallon, take from 16-20 weeks; and a 3-gallon crop may take as much as 30-35 weeks. Many Northern growers may want to look into prefinished plants. For retailers, this is an excellent plant for customers who forget to water; mixed with other succulents, you can market these as plants for dry, windy or coastal locations. Whichever variety you select to try, production guidelines are very similar.
Media. Media must be extremely well-drained; plants prefer to dry down between waterings. A little sand in the potting mix will help stabilize production containers. These plants have thick stems and a topheavy growth habit that may cause pots to tip over in lightweight mixes. Water/Fertility. Dry these plants out! If planting unrooted or rooted cuttings, keep media only slightly moist until new growth begins to emerge. Once the plants are growing, they can handle normal moisture levels but will flower better if kept slightly drier. Excessive drying out can cause lower leaf drop on largeleafed cultivars.
Euphorbia milii prefers moderate fertility levels in production. One of the few ways to keep this plant from flowering is to overfertilize. Either a solution containing 150-275 ppm fertilizer or a medium rate of slow-release fertilizer are adequate at planting. Try using a high-phosphorus fertilizer when plants have reached salable size. The leaf color of many cultivars is naturally a pale green; don't let that encourage overfertilizing of plants.
Light. Plants need full sun to form flowers; avoid low-light production areas. For most of the country these plants will tolerate full, direct sun in production and in the landscape. Growers at high elevations may need light shade for best growth.
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