Answer: Oleander is an amazingly tough shrub, which is why we see it planted so often along freeways and other tough landscaping situations. I suspect that your oleander is just going through transplant shock. Larger sized container plants (such as the 15 gallon) tend to suffer from shock more than the small 1 gallons. Dropping bottom leaves is a way for the plant to cope, allowing the fresh new growth on top to survive. You were correct in planting it in full sun. Overwatering can sometimes cause a plant to drop leaves. Once established, oleander is extremely drought tolerant, so you might want to slack off on your watering to see if that makes a difference. Let the soil just barely dry out and then water very slowly and deeply to ensure that water moves down past the root zone. I think your plant will recover, but if it doesn't, please write again with any other details and we can help you solve it. Good luck!
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