Help! Leaves turning brown! (lemmy.world)

submitted 1 year ago* (last edited 1 year ago) by tehcpengsiudai@lemmy.world to c/gardening@lemmy.world

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Hello, I'm having some trouble figuring out what's the issue for my plants, started with a northern highly blueberry shrub, every couple of days I get about four leaves turning brown just like in the image and they turn brown really quickly. (Takes about a day for half the leaf to go brown, down the midrib)

I've tried these in the past two months:

keeping the plant leaves dry placed in a ventilated area just in case it was fungal.
Reducing watering to only water when soil is try to avoid overwatering and underwatering.
increasing amount of fertilizer slightly to ensure plant has sufficient nutrition
Neem oil sprays to remove pests

Today, I found a similar leaf on my garden mint that's exhibiting the same brown patch on the tip of the leaf, worried it will start spreading.

Has anyone experienced something similar?

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[-] dojan@lemmy.world 3 points 1 year ago

You could be overdoing the fertiliser.

[-] tehcpengsiudai@lemmy.world 2 points 1 year ago

Hmm, alright I'll try lowering the amount for a month. Is there any other symptoms I should look out for?

[-] dojan@lemmy.world 3 points 1 year ago

It's a bit tricky since unhappy plants all kind of have the same symptoms.

Overfertilising basically just means that you give more fertiliser than the plants can absorb. It leads to a change in the chemical composition of the soil, and that in turn can damage the roots, possibly killing some off, lessening the plants ability to absorb nutrients, and water, and opening up for root rot.

The end result of this could be multiple. The plant could try to conserve energy by reabsorbing fruits and leaves, causing the former to stop growing and the latter to yellow/brown and shrivel up. It could slow the growth because of the reduced ability to obtain nutrients/water, and because the plant might be trying to heal/restore its root network causing the above-ground growth to lessen.

Sun damage could also cause leaves to become brown and fall off.

Blueberries I think are particularly sensitive to the soil conditions.