Troubleshooting
Greater Spearwort problems — and how to fix them
Greater Spearwort (Ranunculus lingua) is generally forgiving once you match its basics, but a few issues come up again and again. Here is what each one looks like, why it happens, and the fix.
Invasive spreading by stolons
Greater Spearwort can become extremely vigorous in large ponds, spreading rapidly by stolons. Contain by planting only in lidded aquatic baskets. Divide every 2 years in spring and remove escaping runners.
Aphid and leaf miner damage
Lush foliage attracts aphid colonies in early summer. Dislodge with a strong jet of water. Leaf miners cause pale winding trails in leaves; remove affected foliage and dispose of it away from the pond.
Stem collapse after flowering
Tall hollow stems can collapse in exposed, windy positions after flowering. Position in a sheltered spot or support loosely. Cut back spent stems to the water surface to encourage fresh growth.
Prevent greater spearwort problems before they start
Most greater spearwort issues are care-mismatch, not bad luck. Dial in the basics:
Greater Spearwort problems — FAQ
Why is my greater spearwort invasive spreading by stolons?
Greater Spearwort can become extremely vigorous in large ponds, spreading rapidly by stolons. Contain by planting only in lidded aquatic baskets. Divide every 2 years in spring and remove escaping runners.
Why is my greater spearwort aphid and leaf miner damage?
Lush foliage attracts aphid colonies in early summer. Dislodge with a strong jet of water. Leaf miners cause pale winding trails in leaves; remove affected foliage and dispose of it away from the pond.
Why is my greater spearwort stem collapse after flowering?
Tall hollow stems can collapse in exposed, windy positions after flowering. Position in a sheltered spot or support loosely. Cut back spent stems to the water surface to encourage fresh growth.