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From: Taylor, TX
Region: Southwest
Topic: Diseases and Disorders, Transplants, Trees
Title: Care of Styphnolobium affine, Eves necklace
Answered by: Nan Hampton
It is very likely that the reason your Styphnolobium affine (Eve's necklacepod) (synonym = Sophora affinis) is dying is because of the excess water from the rain barrel overflow. As you can see from the Native Plant Database it needs well-drained soil. If you can find a way to change the direction of the rain barrel overflow so that the soil can dry out, you might have a chance of saving your tree still.
If you can't successfully eliminate the extra water flowing into the area of your tree, your best bet may be to move the tree. An 18-year-old tree is not going to be easy to move. Indeed, the shock of doing so could finish it off. However, if you should decide to do this you might like to read "Successfully Transplanting Established Trees" from the Agricultural Extension Service of the University of Tennessee.
Jill Noke's in "How to Grow Native Plants of Texas the Southwest" (2001. Austin: University of Texas Press) says:
"Eve's Necklace, S. affinis, is easiest to transplant in the winter because it often grows in deeper soil and is deciduous. When transplanting, obtain as large a root ball as possible. The plant should be cut back severely and kept well watered in a shady location."
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