Answer: Without more detail, it's hard to know what is causing this. It could be either over- or underwatering, lack of nitrogen, lack of potassium, or salt burn. Water the plants slowly and deeply to maintain consistent soil moisture, and to leach any salts away from the root zone. You may want to incorporate a a balanced fertilizer (10-10-10) into the planting soil. (Don't overdo the nitrogen, or you'll have foliage at the expense of bloom.) I hope this info helps!
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