spider like plants which are getting quite large (spreading)
Several plants getting quite large (spreading). They are green or green and white spider-like plants, but they don't throw runners. They get purple flowers in September. What is the best way to reduce them in size?
I assume you are asking about liriope, or Monkey Grass. This article should help: https://www.gardeningknowhow.com/ornamental/groundcover/monkey-grass/monkey-grass-a-spectacular-groundcover-for-the-lawn.htm
Liriope should be cut back annually. The best time is just before it starts new growth in the spring. For zone 6b, we usually cut ours to leave about 4''. If you think your clumps are too large, fall is an ideal time to divide and replant. Depending on the size, you could get as few as 2 or dozens of clumps to replant. We usually divide into clumps of 3-5 crowns for a 4'' pot, or 8-10 for a 1 gallon pot.