Hypericum Transplanting Tips
Hypericum is a very robust plant that can take a great deal of abuse. Transplanting hypericum represents little by way of a challenge.
If you are going to be transplanting a hypericum, it is worth putting in some effort to get the soil prepared well. Work the soil well for an 8 or 10 inch depth. Mix in some well-rotted garden compost but only a relatively small amount—say 3 lbs. to each 9 square yards. When you have finished the soil should be a uniform color and nice and crumbly.
If there is no urgency in the transplant, it will be best to wait until just before spring. You will find that many hypericums have created clumps and these will split to create new plants. Cut the plant back to ground level and dig the clump up. Keep as much root as possible. The split clump can be planted in well prepared soil and should start to sprout shortly after the other plants. Keep the plant well watered for a couple of weeks and then you can reduce the watering until you stop altogether.
Moving a Whole Plant
Once again, the best time to move a hypericum is early in spring while it is still dormant. The plant can be simply dug out of the ground and replaced into an area of well worked soil where it will recover very quickly as the year warms up. The more roots that can be retained with the plant, the quicker it will recover. Watering the plant for a week or two will help it to recover faster.
Transplanting hypericum to try to prevent soil erosion can be a valuable exercise. By spacing hypericum over an area at risk you will introduce root systems that will help to bind the soil and new vegetation that will help to keep the soil moist. A pattern of hypericum can be very effective in anchoring sand dunes. In sand dunes the hypericum will need more watering than usual but will still be able to generate healthy new growth. The invasive nature of some hypericum can eventually cover a whole area that might be at risk with a carpet of vegetation.
Transplanting into Containers
Hypericum do very well in containers and they can certainly add a little color in areas that lack it. Containers need to be watered when the soil dries out and be well drained. To give the plants a good start, use a rich soil with plenty of garden compost. It is best to use split clumps to start off a container in the spring but hypericum is so robust that you can transplant a mature plant at almost any time of the year with a good chance of success. When grown in containers the best results for the long term are encouraged by the plants being cut back to soil level every other year. After five or six years you will probably find that the plants have developed large clumps and will need to be thinned out.