We water the plants regularly and they are treated for bugs, what else would cause a plant to wither and die? They are topiaries and face west and receive light during the late afternoon, don't know if this is a factor or not.
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I am concerned about the drainage. The sandy soil may be a factor as well. Thanks.
Sandy soil would provide good drainage. I didn't know they were planted directly in the ground. Typically they need deep but infrequent water if they've been there for 1-2 years. Yes, you could have a soil-borne disease that may or may not be curable
Thanks for the offer, Alistair. I think I have found the problem. We had our home pressure washed and the chemicals used drained off into this area. We have fed and waterered them and they are turning green once again.
This is all great information for indoor topiary plants; however, mine are outdoors. Forgot to mention that. I think your idea about temperature fluctuations could be a factor though as they are in 85+ heat most of the day.
Francis, my hubby mentioned the season factor and it may be part of the reason for their brownish look. Aa I mentioned above to Alistair, they are turning green again. We believe the pressure washer service used a harsh chemical that affected them.
I am going to check the trunks for this and treat the area. Thanks!