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Ive just checked about 5 Hoyas which, altho they appeared healthy..nice green thick leaves, no apparent problem, but for 2 years no growth, and lo and behold, no roots...completely rotten. I think growing mixes really have to be adapted to where you grow. My mix in the UK used to be more of a cactus gritty soil mix. The Nursery where I bought them from 20 odd years ago grew them the same way with no problem. That mix tho dried out quite quickly in a heated greenhouse but soon proved way too heavy here. Over here Ive had to try a few mixes. They grow outside, and whilst it dosent often get over 35º in the summer , its an island, and especially at night, it can get very humid. Ive ended up adding less and less to the mix until Im down to pure orchid bark, which I now have to sift to only get the hard chunks of be it the pine cone, or the bark..otherwise it just dosent dry out at all. Perlite is another thing Ive stopped adding, and am trying to remove it from my old pots as, and I think it does the same for others in humid area, it just quickly dissolves to mush and can cause more problems than help.
So, was just a thought when you read what medium to grow you Hoyas in...Just check from time to time that see that what you've started with is actually working, or wether you need to adapt it to the situation climate you live in.
Once a plant is large, it does seem much more capable of coping with a wider range, probably as its quite root bound and dries out quicker, but for those young plant be careful and check.
Dominic
This message was edited Aug 21, 2009 6:39 AM
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