Fascinating Fact:
Some perennials spread by runners or underground stems and can slowly take over a bed. Labelled “spreading” types suit larger spaces or need edging control.
Perennials spread in different ways, and knowing which kind you have can save you a lot of digging later. Some plants expand as a clump, getting wider each year but staying in roughly the same place. Others spread outward by producing new shoots away from the main plant, either along the surface or beneath it, which can make them “travel” across a border. Spreading perennials can be brilliant for filling gaps and creating a fuller look with less replanting, especially in larger beds. In smaller gardens, the trick is to guide them with simple controls, such as keeping a clear edge, lifting and dividing every few years, or planting them where they have room to move without swallowing slower neighbours.
Key Terms
- Runner: A stem that grows along the soil and can form a new plant where it touches down and roots.
- Rhizome: A horizontal underground stem that sends up new shoots and helps a plant spread over time.
- Divide: To split a plant into smaller sections, then replant them to control size and improve growth.
Frequently Asked Questions (Click to see answers)
What does “spreading perennial” mean on a plant label?
A “spreading perennial” is a plant that expands outward over time, often by sending up new growth away from the original clump. It can fill space quickly, so it may need occasional control.
How do I stop a perennial from taking over my border?
Lift and divide the plant every few years, cut back wandering shoots, and keep a clear edge to the bed. You can also grow strong spreaders in pots sunk into the ground for extra control.
When is the best time to divide spreading perennials in the UK?
Many perennials divide well in early spring as growth starts, or in early autumn while the soil is still warm. Avoid dividing during drought, heatwaves, or when the ground is frozen.
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