My Zeus black currant has got brown edges to some of it's...
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@TryApple67 Are you keeping the soil continuously moist, not soggy? Dehydration or Dry Soil: Black currants thrive in moist but well-draining soil. If the soil dries out completely, the plant will struggle to push water to the edges of the foliage, causing the margins to dry, curl, and turn brown.
Cheers to you both. I thought it might have been overwatering. I check the hydration level regularly with a meter. The surface is dry but 3 inches down it's reading as wet. I've put extra drainage holes an inch from bottom of tub👍