Propagating Salvia Divinorum
Salvia divinorum is usually propagated by cuttings, not by seed. Cuttings may be rooted either in water or directly in soil. Here’s how:
ROOTING IN WATER:
Cut off a branch (4-8 inches long) bearing some leaves. Cut off the leaves that are attached to the lowest node on your cutting then immediately place it in about one and a half inches of water in a small water glass. Only one cutting is to be put in each glass, so if rot develops in one cutting it cannot spread to another.
It is best if the cutting is cut back to just below a node, since nodes are the places from which new roots are most likely to develop. While it is not necessary to make the cut here, doing so has the advantage that there will be no stem material dangling in the water below the node. This is important as the cut stem end is more likely to start to rot than is a node.
Make sure the cutting is made with clean shears, or a knife, so the cut stem does not get attacked by germs and fungi that could cause stem rot. Place it where it will get some filtered sunlight. Change the water daily. It may be a good idea to use cooled boiled water. If your water is chlorinated, boiling will drive off chlorine. Non-chlorinated water may be contaminated with plant disease germs, but boiling should kill these. Rooting in water is successful about 75% of the time (the rest of the time stem rot occurs and kills the cutting).
In two weeks roots will start to develop. When they are about 1/2-1 inch long, transplant to potting soil in a well-drained pot. Cover with a clear glass jar or clear plastic bag to serve as a humidity tent until the plant establishes its roots in the soil and appears vigorous (usually 1-2 weeks). Then gradually wean the plant from dependence on the humidity tent.
Some growers report that Salvia branches that break off spontaneously in summer are more likely to root successfully than those deliberately cut. Rooting in water outdoors may decrease the chance of stem rot occurring. apparently the UV light in unfiltered sunlight acts to kill germs or fungi in the water.
ROOTING IN SOIL:
Salvia can be rooted directly in soil. Materials needed:
- Potting soil.
- Two disposable plastic cups.
- Some Rootone® powder (this is a rooting hormone mixture that also contains a fungicide) it is available at most nurseries in the United States.
- A 1-gallon thin, transparent, polyethylene food storage bag.
- A rubber band.
- Water.
METHOD:
Punch some small holes in one of the cups for drainage. Fill the cup 2/3 the way up with potting soil. Using a pencil or a finger make a hole in the soil about 2 inches deep. The soil is now ready for your cutting. You must now prepare the cutting. With clean shears, cut off a length of stem from a healthy plant. Leave a few leaves (small ones) on top. Harvest the larger leaves from the cut-off stem. Immediately after cutting the stem, place it in clean water. Cut it back to just below a node, as roots will develop from the node. Keep the cut surface wet. Place the cut surface, and the stem for about 1 inch above the cut, into the rooting powder. Shake off the excess. Rooting powder is somewhat toxic, so wash your hands after handling it. Place the powder coated cutting in the hole in the soil. Gently push the soil around the cutting, holding it in place while filling in the hole. Water the planted cutting until some water runs out the drainage holes. Place the cup with the plant in it into the second plastic cup (which is there to catch any runoff water). You may want to put a small piece of wood or plastic in the bottom of the outer cup to act as a spacer. This allows enough space for excess water to drain. Place a 1-gallon clear plastic bag over the rooted cutting, using a rubber band to hold it in place. The rubber band should be outside the bag and the bag outside both cups. The Rubber band holds the bag against the cups. As the plastic bag acts to conserve moisture, frequent watering is not required. After several weeks you can transplant the now rooted plant to a larger pot.