Answer: Most herbicides contain chemical growth inhibitors and cause the interruption of mineral and water uptake in plants. Sounds as though your calla's were exposed to enough herbicide to seriously affect them. You may have to replace the plants. But before you give up completely on them, try nursing them through the season. Fall rains may help leach the herbicide residue from the soil, or it may biodegrade on its own. The plants may not be permanently injured. If growth is poor next spring, replace the plants.
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