Top Questions About Grevillea Plants

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Questions About Grevillea Plants

Asked by
Anonymous on
October 17, 2011

Q. Grevillias and White Oil

I have been advised to use white oil insecticide on my Grevillias for black scale and other pests. It won’t harm the bush, will it?

Answered by
Nikki on
October 17, 2011
Certified Expert
A.

Just make sure that you do not use it in bright light. White oil can occasionally burn a plant on a very sunny day. You may also want to look into neem oil. It is effective on these pests and safe for people and pets and will not intensify sunlight. Here is more info: https://www.gardeningknowhow.com/plant-problems/pests/pesticides/neem-oil-uses.htm

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Asked by
rodjules23 on
September 2, 2012

Q. Spotted Garden slug

I have just been pruning under a large Grevillea, as its lower branches were laying on the ground. I have come across two very large spotted garden slugs – Limax maxumus. I have found one other one about 12 months ago. Can you tell me how to get rid of them please?

Answered by
Nikki on
September 2, 2012
Certified Expert
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Asked by
elsid2272 on
September 30, 2017

Q. Grevillea ‘Long John’

I have a 3yr old Grevillea ‘Long John’ in the ground. It is thriving and looks beautifully alive. But for the last 3 months or so the foliage is turning from a dark green to yellow.
I had been watering it twice a week for 8 minutes and when I noticed it getting lighter I changed it to 8 minutes once a week. It did not seem to make any difference, it is now almost yellow. But it still looks absolutely blooming.

WHY IS THIS PLANT TURNING YELLOW?

Answered by
BushDoctor on
October 1, 2017
Certified Expert
A.

This sounds like a pH issue. Is this close to any water outlets, or maybe the street? It appears to be experiencing some pH swings. I would recommend applying dolomitic lime to the area around the tree. Here is a link to some articles that will help: https://www.gardeningknowhow.com/houseplants/grevillea/

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