Ask a Question forum: madagascar periwinkle

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Apr 6, 2017 12:01 AM CST

I live in Bangkok and have two madagascar periwinkle. They get around 2hrs of sun per day.
As you can see on the photos, the left one is doing fine, but the right one is loosing all its leaves, but keeps growing.

I actually want to keep both plants small and green.
Shall/can I prune them?
I want to avoid that they keep growing, but still want to have them fully in bloom.

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Name: Stewart
Pinehurst, Texas (Zone 8b)
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Apr 6, 2017 7:46 AM CST

Is the plant on the left shaded by the middle plant, or do all get the same exact sunlight? How hot does the granite wall get?

The only thing that I can say about periwinkle / vinca's in my area is that I planted them "once" and they took over, could not keep them from running and blooming. I have never seen a flower that large from a vinca. The ones that I am aware of are ground cover, solid green stems and maybe a 1 inch to 2 inch bloom.

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Name: greene
Savannah, GA (Sunset 28) (Zone 8b)
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Apr 6, 2017 8:29 AM CST
My best guess would be root rot. Are there holes in the pots? Do the holes allow for adequate drainage? Perhaps the planting medium remains too wet.
Sunset Zone 28, AHS Heat Zone 9, USDA zone 8b~"Leaf of Faith"
Apr 8, 2017 11:07 AM CST
thanks for your responses.
There is a hole in the pot, but the saucer is full with water.
I should empty it regularly.

I will also move the plant a bit from the wall.
Let's see if it helps.
Apr 20, 2017 6:21 AM CST
actually I realized that the roots are indeed often in the water.
I dont want to move it to a bigger pot, as I like the existing pot and I want to keep the plant small.

Is it possible to just cut the roots which are overlapping/coming out of the pot, as you can see in the pictures?

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Name: Tiffany purpleinopp
Opp, AL 🌵🌷⚘🌹🌻 (Zone 8b)
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Apr 20, 2017 7:50 AM CST
Your plant looks like Catharanthus roseus, a small upright woody perennial shrub, while it sounds like @Plantmania was describing Vinca minor or Vinca major, which are groundcover vines.

Yes, repotting (trimming roots, removing old soil, replacing with new) could do wonders for the plants' health by giving the roots a chance to grow normally again. Changing out the old soil should also help with what looks like minor chlorosis.

If you consider trimming, maybe trim one stem now, then wait to do the other one until the first stem has produced satisfactory new growth. A minor trim periodically can eliminate the need to ever have to do a more major trim. It's never as fun to have to wait through a plants' "just got a haircut" phase.

If your plants make seeds, sprinkling them in the pot could yield some seedlings that would help make a more full display.

Your Aglaonema is lovely!

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Apr 20, 2017 10:07 AM CST
Hi purpleinopp.
It's definitely Madagascar periwinkle. Vinca minor I am not sure wether it exists in Thailand.
I just wonder wether u can keep this plant little by cutting it and also cutting the roots. I wanna keep it small. I'll give it a try

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