I got a periwinkle plant from a relative. She's a bit absent-minded and barely watered it. When I got it, the branches were all bare (leaves fallen off) and no flowers.
I have had it a few months now. Since then, it flowers regularly and even self-seeded a few months ago.
The problem is, that though the branches have grown longer, there are only leaves on the 'new' part of the branch. The lower half, where leaves fell off before, has not grown leaves. Because of this, the plant looks rather odd.
I researched this online and some sources say the plant will only grow towards the top of the branch, and the best step is to cut the branch off, throw away the leafless part, and re-plant the part of the branch that has leaves. But this seems like an extreme solution and I don't want to do it unless it's the only option.
Also, from pictures I've seen online, the leaves seem quite small compared to other periwinkle plants. I planted the seeds I got from this plant, and the new plants look much healthier and have larger leaves.
This is the seedling:
Apart from this, the periwinkle has an odd sort of fuzzy growth on the lower leaves. It's not that noticeable and I thought it was normal, until I saw that the seedling's leaves don't have the same growth. This comes on both green and yellow leaves.
I wasn't sure if I was watering the plant right, so a few weeks ago I purchased a moisture meter and I only water when the meter shows that it's dry or low moisture. It hasn't made a difference, but it hasn't been that long. I check the water level daily.
The place I live in has a desert climate and the plants get a lot of full sun. They are kept outside 24/7.
Appreciate any insights you can share.