Understanding my periwinkle

This is a gardening question by the way.

I’ve had periwinkle growing around three trees along with some english ivy for several years. Last year I yanked some of it up and transplanted it to the north side of the house where nothing much had been growing and along the front of the house and put the vines up on a trelis. So there are some old plants and some new ones and some different environments.

Until this year, it had always grown mostly as vines with very few blooms. More like ground cover than anything. Anywhere the vines are on the ground a new plant might start. In the confined area around the trees, it would overgrow and turn brown and I’d cut it off about 4 inches high and it would take off again.

This year, though, I’ve got blooms everywhere. Everywhere they are located, they are growing straight up with blooms all along the stem. They are growing like you would normally see it in the nursery. Periwinkle is also called vinca.

I can’t figure out why it is doing this all of a sudden. I like it, I always thought it was suppose to do this, but why now? And how do I make it do it every year.

The weather here in Dallas has been a pretty typical winter. It started earlier and got mild earlier than usual and has been more rainy than usual. The past 2 or 3 winters have been very mild but dry. Before that, pretty much normal. I can’t really put my finger on what the difference is.

So, does anyone out there understand their periwinkle?

Jim