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By Ccserb

Ontario, Canada Ca

I have a Mandevilla plant that I brought indoors for the winter. The leaves and everything dried up but this pas month it has sprouted new shoots and has started growing again. However, it grows the first 2 leaves then more vine and 2 more new leaves. Once the second set of leaves come in the first set turn brown and dry up and fall off. Now the first shoot/vine has stopped any new growth and is turning brown and dieing. What's going on? Also, most vine plants require they be trimmed back so they will grow more than one vine from the same shoot. But when I trim this plant back it just dies. Please help. Thank you.

On plant Mandevilla

Img_9200 Img_9201 Img_9202



It looks like it isn't getting enough light. I would put it directly in front of a large, north-facing window, within three feet of the window, and keep the drapes or blinds open all day. An east-facing window could also work, but a light chintz curtain would help there. Keep in mind that the human eye adjusts to different light levels, so just because a room looks bright, doesn't mean that there is enough light available for a plant to photosynthesize.

28 Feb, 2011


Thanks for the info.

Hmm, it's in a South facing large (5x5 foot) window and it gets full direct sunlight from 10am to 5pm. it's the brightest window I have but I could always put a grow light on it as well.

28 Feb, 2011


That's weird! I would expect it to show symptoms of sunburn, then. Did you move it there recently, then?

28 Feb, 2011


Lack of humidity?

28 Feb, 2011


I moved it there after the first shoot/vine sprouted. The Lack of humidity could be it. Um, it's a forced air heating system in my house and the humidity has been all over the place. I do try to keep it at 50% but it falls to 30-40% when the air comes on. I'll try spraying the leaves with a water mist and see what happens.


The sun is really low here, I'm in Northern Canada. In the summer there is no direct sunlight in my front window, so I guess it wouldn't be burning because the sunlight really isn't very strong at this time of year. Sorry, I forgot to mention that.

28 Feb, 2011


If the days have been mostly dark and snowy, that may not have allowed enough light either. I would also double check the soil moisture--keeping the soil saturated, or allowing it to dry too much between waterings can cause those symptoms, too. I wouldn't worry about 30% humidity, but 10% would be a problem!

1 Mar, 2011


Ok, I know last year I had a grow light on it for about 14 hours a day and it never saw the actual sun till spring and had no problems. Is there a particular soil that it likes?

I did just give it a good watering and will let it dry and see how that works.

Thanks for the advise.

1 Mar, 2011


I always use store-bought cactus mix. If you cant get that, sift regular potting soil through counted cross-stitch screen, use the coarse part, and add grit and pumice (or perlite), to bump up the mineral fraction.

1 Mar, 2011


I was debating transplanting it in new soil...the soil it's in right now is a mix of what was in my garden 2 summers ago and new soil but just regular potting soil not cactus soil. I will try to find some of that or make some like you suggested.

Should I try to clean off all the dirt and start with fresh stuff or would that be too much of a shock to the plant?

3 Mar, 2011


Probably too much of a shock in its weakened condition. I would nurse it along with careful watering, and maybe water it with a tablespoon of gypsum dissolved in a gallon of hot water--left to cool before applying, of course!--to flocculate any clay particles in the present mix. Once it recovers some vigor, the soil can be replaced.

5 Mar, 2011

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