Cross-Contaminated Watering Cans: No Risk to Edible Crops from Mixed Fertilizer Residues

Husband used same watering can for lawn feed, ericaceous feed, then tomato feed on tomatoes and runner beans. Worried if safe to eat.

Vegetables Are Fine

Plant food is plant food—only nutrient percentages differ. Azalea fertilizer regularly would lower pH over time. Lawn food high N would cause excessive veg growth. But one-can use has zero effect.