That is not normal. Since the loss is in the lower parts of the plant my first thought is that the lower areas are being shaded out by upper parts, resulting in loss of leaves in the shaded areas. If this is not the case the second consideration is that something was sprayed or splashed onto the lower parts of the plant to cause leaf drop. Finally it may be that the loss is due to a soil moisture extreme. Both drought and poor drainage (soggy soil conditions) can damage roots and cause leaf drop.
There is no fix for the first problem and the second just takes time to regrow. The soil moisture problem is remedied by either watering less or more and/or redirecting water to prevent extended soggy spells.
I hope this helps. You may also want to take a sample from the plant along with a photo of the plant in its growing location (if possible) to your Dalla County Extension Office (Texas Cooperative Extension) to see if they can help diagnose the problem and recommend an appropriate course of action.
Thanks for the question. Please stop in again soon!
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