I have tried numerous things and it's getting expensive. It was beautiful but the bush and tender leaves are being infested with pesky aphids. They are killing my hibiscus, which is 3 feet tall with large, 8-9 inch pink and cranberry blossoms. Help.
Aphids on My Hibiscus
Certified GKH Gardening Expert
This article should help you:
You may also want to try neem oil. This is very effective against aphids. Here is more information: https://www.gardeningknowhow.com/plant-problems/pests/pesticides/neem-oil-uses.htm