Please take your time removing your plant from it's packaging.
Getting started -- Your plant was grown in filtered sunlight, so plan on acclimating it to direct sun slowly, over the course of a few weeks.
Pot size -- Transfer your plant to a deep, 1 gallon container, and then transplant to a 3-5 gallon pot when the roots reach the bottom, or after 2-4 months. After a year, it will probably need 10 gallons or more.. although a smaller pot might work if the plant is pruned back regularly.
Soil -- Most ordinary potting soils should work, provided that they are well-draining. The pH should be slightly acid - around 6.5.
Transplanting -- Transplant carefully to avoid disturbing the fragile roots. Before sliding the plant from its pot, give it a watering if the soil looks dry, so the soil doesn't break apart. If the plant is hard to slide out, squeeze the bottom edges of the pot and then pull gently from the stem. If that doesn't work, stick a pen or a stick into the holes at the bottom to help push it out. Water thoroughly.
Watering -- For the first month, please ensure that the original soil ball remains moist all the times. You may use a moisture meter probe to monitor the moisture levels deep in the root zone. I recommend using rain water or bottled spring water for at least a couple months. That's because the tap water in many parts of the country may have unwanted chemicals. If you use a filter, avoid ones that add sodium to the water, like Brita or Pur.
Temperature & humidity -- Carmichaelia seems to do best between 45 and 80 degrees. Since very few people are growing this plant, i'm not sure how well it will do outside that temperature range. Feel free to experiment with rooted cuttings. Your plant may be grown indoors, provided that the air isn't too dry. Between 50 and 80% humidity is preferred.
Sun -- Carmichaelia prefers mostly sunny conditions, but give it protection from strong mid-day sun in warmer areas. I would keep the pot shaded, to avoid overheating the roots
Fertilizing -- After the first month, give feedings every other month during periods of active growth using ordinary, balanced fertilizer with micronutrients, such as 5-10-10 or 8-15-10. It's normal for an older leaf to occasionally turn yellow and drop, but if it's excessive, the plant might need more nitrogen. Don't try to force more growth with excessive fertlizer.
Pests to watch for -- mealy bugs, scale (small brown disks - hard to see), slugs & snails.
Enjoy your plant!
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