Periwinkle is a very special hardy perennial groundcover. Know in the plant world as Vinca Major. If you are having a difficult time growing grass in an enclosed area like around a tree periwinkle is great. I have always thought it is a wonderful addition to anyone’s yard who wanted to plant something easy, have it look great, and not have to worry about it at all. In the fall you can blow leaves through it, around it, over it, stomp all over it at any time and still have it look great for 4 seasons a year.
However, it also gets a bad rap as being too invasive. Well my attitude is that if something that is doing so good in so many ways has a problem or two, may as well figure out how to fix the bad parts or learn to live with them. Then you can enjoy all the good they offer. They are much easier to control their growth as they shoot their new roots from above. Their growth is achieved by arching rooting stolons instead of some ground cover that expand their growth by spreading Rhizomes (under the ground) like Pachysandra. This is much more difficult to contain and get rid of.
If you ever need to get rid of your periwinkle to grow more grass. you can just pull it up with your hands. Ripping it out close to the ground.
To simply trim it and contain the plants, For starters, make sure the plants have a boarder. If you will have it along side your lawn, using a commercial lawn trimmer works very well, faster and easier than shrub shears to keep it off the lawn. Not so fancy, but if you have a large property you cannot be too fussy about every maintenance job you have. Yes, shrub shears would work nicely but will take more time and you you may never get around to doing it.
Trim them back a few times a year. You can’t kill the stuff, so just cut it back in it’s place.
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