Answer: To address your second question first, I suspect the shock of being transplanted is what's causing the wilting in two of your new plants. There's not much you can do to improve the situation except to wait it out and prune away any dead stems once the plants perk up. If the plants continue to produce yellowish leaves, your soil is too alkaline and an application of iron will improve their appearance.
Brunfelsia has a spreading habit and will easily reach 10' high if allowed to grow unchecked. However, they can be held to about 3' with regular tip pinching and early spring pruning. The plants are heavy feeders so be sure to fertilize regularly throughout the growing season.
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