Sollya not thriving

Why might my Sollya heterophylla plants not be thriving?  They are in 
alkaline soil (about 7.3), they're in the shade of Deodora cedars, they've  
been in the ground for 3 or 4 years.  They get some filtered sun, especially 
in the afternoon.

One plant is doing fairly well, and the others are about the same size they 
were when planted.  Could I be watering too much, not enough?  Should they be 
kept dry in the summer?

Thanks,
Nancy Gail
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