How do you take cuttings from a plumeria plant?
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Growing Plumeria from a Cutting
Prepare a mix of 2/3 perlite and 1/3 potting soil and fill a large container. (You can also plant them directly in the ground if you live in a very warm climate). Dip the cut end of your cuttings in a rooting hormone and sink them about halfway down into the potting mixture.
Also question is, how long does it take for Plumeria cuttings to root?
4-8 weeks
Also asked, can you root plumeria in water?
Propagation is done in the spring through stem cuttings that produce a plant that is true to the parent. The plumeria cuttings can be rooted in soil or water with equal success. The advantage of rooting in water is that you can see when the plumeria starts the process of root formation.
Coffee grounds are said to be acidifying, and Plumeria prefer a soil on the more acidic side, so that might be why you've been told that. Organic, fresh, coffee grounds do have a small nitrogen content too.