Answer: It could be that the wheelbarrow got too hot and the roots baked. If it is metal, or even wood, try covering the inside with an insulation such as the half-inch styrofoam panels that are sold for insulating hot water heaters. Then fill the wheelbarrow with potting soil or a half and half mix of garden soil and potting soil. Be sure there's adequate drainage holes in the bottom of the wheelbarrow. Good luck with your plants!
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