Grevillea Plants

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  1. Grevillias and White Oil
  2. Spotted Garden slug
  3. Grevillea 'Long John'
Asked by Anonymous on October 17, 2011
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?

ANSWERS
Nikki
Certified GKH Gardening Expert

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@bigpond.com on September 2, 2012
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?

ANSWERS
Nikki
Certified GKH Gardening Expert
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Asked by elsid2272 on September 30, 2017
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?

ANSWERS
BushDoctor
Certified GKH Gardening Expert

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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