If you already have strawberry plants growing in your garden you can make more plants yourself by propagating the old ones. This is preferred over bringing home plants from another garden because you risk bringing home pests with you, like strawberry mites or nematodes.
You can propagate strawberries by dividing old plants or by taking care of the runners sent out by old plants. If you pinch off the flowers of a selected few old plants you’ll encourage more and stronger runners:
With a 10 cm (4 inch) pot buried beneath a runner it will soon send roots into the pot:
Provided with good potting soil the new strawberry plant will be off to a good start and it’ll be easy to replant since the roots will be intact when you remove the pot and replant elsewhere without the pot.
Cut the stem from the mother plant and replant at 40 cm (16 inches) between plants and 75 cm (30 inches) between rows. These new plants will provide you with healthy strawberries for three seasons before the yield drops and the bed should be replanted, preferably with another type of crop to avoid a build-up of diseases.
After each season most of the foliage should be removed to make room for berries next year. In the picture below in the bottom, three plants have been pruned and the original foliage mess is shown to the right:
Light and air can now reach the plants which in return will provide you with plenty of healthy strawberries in the coming season.