Trachelospermum jasminoides problem
I have 3 TJs, planted this spring in a brand new garden (new house) all growing up columns on a pergola. One is a healthy green, one is showing signs of leaves going red but otherwise looks relatively healthy and 1 is looking decidedly sick with wilting red leaves! All have flowered well up til now. Any ideas as to what I need to do to save the poorly one and is the other one with leaves turning red likely to go the same way? I have been watering them up til recently when I read that they don't like too much water, so I've stopped that. The soil is heavy clay to which we've added compost and a few inches of bark.
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I'm assuming none of these plants are grown in pots and all three are growing quite close to one another. Red leaves usually happen in colder weather and sometimes, they do persist into the warmer months with these plants. But, it's usually due to stress in the warmer months. As you pointed out, they do not like clayish soils, so it's important that drainage is not just at the top part of the plant but all the way through, especially if you have clay soil that has not been loosened enough. I am wondering whether you have over-watered them and some are suffering a bit. I agree you need to calm down with the watering and give the plants a general feed and see what happens.