How to encourage new Lilly Pilly Hedge growth after thinning out?

[Invermay]

My lilly pilly hedge is 9 years old and we live in Victoria. Last year it had problems with bug infestation and I sprayed it and fertilized it and it bounced back extremely well with new growth and looked really healthy.  Now some 6 months later it has thinned out badly. There are no signs of any bugs. Any thoughts how to encourage new growth and to thicken foliage? Should I apply fertiliser more heavily? I've used an all purpose Powerfeed in the past purchased from Bunnings.

[MitchellMc]

Hi @Invermay,

It’s great to hear that your Lilly Pilly bounced back so well after the bug infestation, but it does sound like there may still be some underlying issues if it's thinned out again. If you’re already fertilising with something like Powerfeed and using it according to the directions, then it’s possible the problem isn't related to nutrients alone. There could be environmental or root-related factors at play.

To get a better idea of what might be going on, could you please share some photos of the hedge—including the overall plant, close-ups of the leaves, and any signs of damage or discolouration on the branches? That way, we can better assess what might be causing the decline and give you more targeted advice on encouraging healthy, dense growth. 

Please let me know if you have any questions.

Mitchell

[Invermay]

Hi Mitchell
Sincere thanks for your prompt reply. The hedge is breaking my heart! It's 1.4m high x 13m long. I used the Baythroid Ad vanced twice last year to get rid of the bugs that leave little Lumps on the leaves and another bright green bug. I've applied one scoop of fertiliser to each in the past. Some photos attached let's know if more required. Very grateful.
David ( Invermay)

[MitchellMc]

Hi David (@Invermay),

Thanks for the update — and totally understand how frustrating this can be! It can definitely be a challenge to get new growth to emerge from older timber, as Lilly Pillys are more likely to push new shoots from the top where sunlight is more available. To help encourage fuller growth, it’s important to keep the height of the hedge in check so that light can reach the lower branches.

Regular, light trimming of the top can redirect energy into lateral growth, while consistent watering and a good-quality slow-release fertiliser can support recovery and encourage fresh shoots. Keep an eye out for pests and continue to treat as needed, but also give the plant a little time — with the right care, it should bounce back. 

Typically, even slow-release fertilisers only last 12 months. If it is still within twelve months, you could add some organic fertiliser such as Powerfeed.

Mitchell