The orchid tree (varieties of Bauhinia) is a valuable landscape plant with 5-inch-wide, fragrant, showy flowers which appear from September to November, making an impressive fall display when most other plants are entering dormancy. Growing quickly 35 feet tall and wide, the orchid tree is a perfect for choice for parking lot islands, street medians, lining driveways or as a specimen tree in the center of a lawn. Orchid trees can be propagated a number of ways, but propagating with cuttings is the most common, according to the University of Florida.
Propagation of Softwood Tip Cuttings - Remove a few dozen softwood tip cuttings (actively growing tips from branch ends) from your orchid tree in early to mid-summer. Softwood tip cuttings should still be green and supple (not bark-covered and woody), and should have a rosette of newly emerging leaves at the tip. Cuttings should be 4 to 5 inches long and smaller than the thickness of a pencil.
Remove the lowermost leaves of each cutting, then dip the base of each cutting into a rooting hormone powder or solution. Rooting hormone will hasten the development of roots and is often paired with a fungicide that will protect the cutting from fungal attack.
Mix one-half washed sand (or perlite) and one-half peat most in a clean bucket. Fill the compartments of the seed starting tray with this mix. Water the mix gently to settle the soil and remove any air pockets. Make a hole in each compartment of the seed starting tray with a chop stick. Each hole should be approximately 2 inches deep and wide enough to accommodate each cutting without removing any rooting hormone/fungicide when inserted.
Insert a single tip cutting into each hole made in the potting mix until the tray is filled. Carefully firm the mix around the base of each cutting. Gently water the cuttings and potting mix with a mist of water. Place the included cover over the seed starting tray to help retain moisture and keep the humidity high around the cuttings. Move the tray to a protected, warm spot, out of bright light or direct sun. Mist the cuttings daily to keep the soil moist and humidity high.
Check for roots after three to four weeks. Grasp a single cutting and give a gentle pull upward. If the cutting resists and does not pull from the soil, roots have most likely formed. If the cutting does not resist and pulls freely from the potting mix, roots have not formed. Cuttings may take from two to 16 weeks to grow roots. Allow rooted cuttings to grow in the tray for four to six weeks in bright light and moist soil. Transplant the following spring to 6-inch pots filled with a fast-draining commercial potting mix.