The fastest growing ground cover for most yards is creeping jenny, with ajuga and sedum close behind. These three spread fast and fill open dirt in a single season once they take hold. They beat almost every other low plant you can buy at a garden center. Creeping jenny leads the pack in moist, shaded spots. Ajuga takes over part shade. Sedum wins the dry, sunny ground where most plants give up.
A fast spreader still will not cover bare soil overnight. Even a strong fast spreading ground cover needs a season or two to knit its plants together into one solid mat. You plant small starts in spring, they send out runners, and those runners root and branch. The first summer looks patchy with bare dirt between each plant. By the second summer, the gaps close and the mat fills in. Plan for that wait. The plants are working below the soil even when the top looks thin.
Speed comes down to how a plant moves. Some grow by runners or trailing stems that crawl sideways and root as they go, so they jump into gaps fast. Creeping jenny and ajuga both work this way, and you can watch a stem add inches in a week of warm weather. Others are slow clumpers that only widen a little each year and leave dirt showing for a long time. Mondo grass and many fescues fall in that slow group. Even with the quick spreaders, full coverage can take up to two years, so patience pays off. Good soil, steady water, and warm months all push that timeline shorter.
There is a catch with the very fastest plants. The same traits that close gaps in months also let these plants jump your bed and crowd out everything else. Creeping jenny and ajuga both show up on aggressive or invasive plant lists in many regions. Once they reach a lawn, they spread into the grass and refuse to leave. Speed and good manners do not always come in the same plant. Check your state or county plant list before you buy either one, since a few areas ban them outright.
- Sedum spreads quick in dry, sunny spots and stays where you put it.
- Creeping thyme fills paths fast and takes light foot traffic.
- Most of these stop at a bed edge instead of jumping it.
- Creeping jenny races across moist soil and into lawns and beds nearby.
- Ajuga seeds and runners hop into turf and choke out grass.
- Both can need yearly cutting back to stay in bounds.
Spacing matters as much as the plant you pick. To get the quickest cover, set your starts in staggered rows instead of a straight grid. Offset rows leave smaller gaps between plants, so the runners meet sooner and close the soil faster. Space them closer than the tag says when you want speed. If the tag calls for 12 inches, drop that to 8 or 9 inches for a fast fill. You buy more plants up front, but the bed knits together a full season sooner. Water the new starts well for the first few weeks so the roots dig in fast.
Pick a fast but well-behaved plant over an invasive one. You still get quick coverage ground cover and you skip the chore of pulling it out of your lawn later. Sedum and creeping thyme fill space fast and tend to stay put. Save creeping jenny and ajuga for a spot with a hard edge. A bed ringed by concrete or a deep buried border works well. There the plant cannot escape into the rest of your yard. You get the speed you want and keep the spread in check.
Read the full article: Flowering Ground Cover: 12 Best Plants
