PlantPal

Burned tips after feeding?

Brown margins soon after a heavy dose of fertilizer can point to excess salts.

Fertilizer damage on a cannabis leaf; brown tips have other possible causes.
Fertilizer damage on a cannabis leaf; brown tips have other possible causes. Photo: Fenrisulfir · CC BY-SA 3.0 · Resized and converted for display.

What to check first

Review what you used and how much. A crust on the mix or pot rim can be a clue, though hard water can leave deposits too. Check if the pot drains freely.

What to do now

Pause feeding. If excess fertilizer is likely, the plant tolerates a thorough watering and the pot drains freely, flush the mix with plain water and let it drain. Do not flush a waterlogged pot.

What to watch next

Watch new growth; scorched edges will stay brown. If browning spreads or the pot stays wet, check roots and drainage before feeding again.

Sources