Yellowing of Leaves

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darkempress2003 Riverview, FL May 22, 2007

I've recently purchased a Parasol Sun Crimson Mandevilla from Lowe's. I love it, it 'was' beautiful. It does not flower any more.
It sits on my patio which gets b/t 3-4 hours of sun in the morning. I water it roughly every other day or when it feels dry about 2 inches into the soil. In the large planter is also a pink dipladenia, and it seems that whatever is plaguing the mandevilla is now affecting the dipladenia.
I recently watered it with the miracle grow all purpose fertilizer.

The leaves discolor and then just drop off. In a week it won't have any leaves left. In any given day b/t 12-15 leaves just drop off per day. I wonder if it has been over fertilized and I should put it into neutral soil?
I'm thinking about seperating them, washing the roots off and putting both into different containers with neutral soil for a while. What do you all think?

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trackinsand mid central, FL(Zone 9a) May 22, 2007

too much water and not enough sun, i'm thinking. also, it's going to get pretty crowded in that pot with two vines. i never feed a plant that is obviously stressed. now you can't go putting it in bright sun when it's in this shape, but once it recovers, yes, more sun.

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ecrane3 Dublin, CA(Zone 9a) May 23, 2007

Leaves turning yellow and dropping off usually makes me think overwatering. I know you said you're waiting until it's dry 2 inches down, but maybe check down even farther, if it's in a pot that doesn't have a lot of drainage holes or something then it could be soaking wet down a little farther which would still be bad for the plant. If that's the case, it's not a bad idea to repot them in fresh soil. I agree with trackinsand too that the two vines in one container is probably going to be a bit much eventually, you'd probably be better giving them each their own pot.

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