Catmint spread is slow and easy to manage for most garden types. Popular hybrids like Walker's Low and Cat's Meow grow outward from a central clump at a steady pace. They don't send runners across your yard or pop up in random spots. You can expect a mature clump to widen by 2 to 4 inches (5 to 10 centimeters) per year in each direction.
I've grown Walker's Low along my front walkway for six years now. The catmint spread has been simple to handle the whole time. Each spring the clumps come back a bit wider than the year before, but they stay right where I put them. I've never found a seedling growing in my lawn or in a distant flower bed. So is catmint invasive? Not the hybrid garden types. They stay put and act like polite border plants.
The catmint growth habit of hybrids explains why they stay so well behaved. Walker's Low and Cat's Meow are sterile plants. They make pretty flowers but those blooms don't produce seeds that sprout. Without seeds, the plant can only grow by pushing its root clump outward. You get a tidy mound that gets a little wider each season instead of random babies all over the place.
NC State Extension backs this up. They confirm that Nepeta x faassenii hybrids are sterile and won't reseed. But the story shifts if you grow Nepeta cataria (true catnip). True catnip makes viable seeds and can sow itself around your beds if you skip deadheading. The seedlings pull out fast, but they will pop up in spots you didn't plan for.
To keep your clumps tidy over time, divide them every 3 to 4 years in early spring. Dig up the whole clump and split it into sections with a sharp spade. Toss the woody center and replant the healthy outer pieces. This stops the middle from dying out and gives you free plants for other spots in your garden. Metal or plastic edging along walkways also creates a clean line the clump can't cross.
When I divided my oldest catmint last spring, I got four strong sections from one big clump. I planted two along my back fence and gave the other two to a neighbor. That single original plant has now filled three different garden beds across two yards. The catmint spread stays tame when you manage it, but you still get plenty of plants from the deal.
If you want the tightest growth possible, pick Cat's Meow. It stays around 20 inches (50 centimeters) wide and rarely needs splitting more than once every few years. Pair a compact hybrid with some basic edging and you'll enjoy flowers and fragrance all summer. You won't ever worry about catmint taking over your garden beds.
Read the full article: Catmint Plant Care and Growing Guide
