Black tips on banksia leaves

[Sam Bennett]

I planted a dwarf Banksia in my front garden last spring, and while it’s growing well, some of the leaves have blackened edges. Any thoughts why this is happening?

[Nathan Schwartz]

Hey Sam,

Blackened leaf edges on your dwarf Banksia could be caused by a few things. If you’ve had any cold snaps, frost damage is a possibility, especially if the plant was still establishing itself over winter.

Overwatering or poor drainage can also stress the roots, leading to leaf discolouration. Banksias prefer well-draining soil, so if the area stays damp for too long, that could be a factor.

Another common cause is fertiliser. Banksias are sensitive to phosphorus, so if you’ve used a general-purpose fertiliser, consider switching to one specifically formulated for Australian natives.

Salt build-up from bore water or coastal exposure can also cause browning edges. If the blackening is spreading, it could indicate fungal or root issues.

If the new growth is looking healthy, I wouldn’t be too concerned, but keeping an eye on drainage and ensuring you’re using the right fertiliser should help keep your Banksia thriving. Let me know how it goes!

Cheers!

Nathan

[Author]

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