The Q&A Archives: Nasturtiums

Question: I have 5 hanging baskets of nasturtiums raised from seed in late April. They were planted in new planting soil. They have grown beautifully and are beginning to get flowers. I water when they should be and use Miracle-Gro every 2 weeks. All of a sudden some of the leaves have started to curl around the edges and discolor. I have looked all over the plant and don't see any bugs or anything that I think would cause this. Can you tell me what I can do?

Answer: Nasturtiums are generally disease free but do attract sucking insects such as aphids. Aphid feeding can cause a yellowing, stippled look but generally do not cause crispy brown edges on the leaves. I'd look instead to cultural practices. Over-watering can cause this, as can fertilizer burn. You might try immersing the pots in a larger container of water to help leach fertilizer salts from the potting soil and to eliminate any air pockets that may have developed around the roots. Feeding every 2-3 weeks with Miracle-Gro is fine, just be sure to periodically immerse the pots to help rinse out accumulated salts. You can pick off the affected leaves (which will encourage additional growth). Best wishes with your nasturtiums!

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