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hi Yvonneduchen.
Blooming mandevillas need moist soil that drains well enough to prevent standing water. Too much water can choke the roots so they don't feed the plant adequately. This can cause the leaves to turn yellow. Conversely, too little water can be deadly, starting with yellow leaves that turn brown and drop off the plant.
or try this link. Yellow Leaves On Mandevilla Reasons For Yellow Mandevilla Leaves
or this one. dipladenia leaves turning brown Google Search
I have grown Phalaenopsis ochids for very many years,
I have found over the years that it is not necessary to use the bark chips to fill pots I do a mixture of bark chippings and general purpose compost as this is sterilised, and have had some fantastic displays as I have now, they do not like direct sunlight at any time or drafts and extreme heat with a moist air were possible and only need a 2 table spoons of water every month move the plant from the pot and shake all loose bark chips from the root system next cut any dead roots from the plant when, you are happy with that making sure you shake or bump the pot to make sure the media gets in-between the root system do not firm it in place just leave it and as soon as it as sorted it's self out you should have a nice flower stem or two start to appear, it's not necessary to have drainage, I have three or four plants growing in a very fancy shallow bowl and when they all flower at the same time, I have a fantastic display I have about 30 of these orchids plus some very special ones, but remember never ever over water them you will know if you have healthy plans as the leave should be a nice glossy green. they also do like very cool temperature at night but not stream cold.
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