6. Insecticidal Soap
There are many premixed all-natural insecticidal soaps treatments available for garden pest-control. Always remember to read and follow the instructions provided with these products to avoid inadvertently harming any beneficial species of insect that may be present in your garden.
7. Beneficial Insects
In some cases, it may be easier to introduce new or bolster existing populations of predator insects into areas infested with aphids. The most well-known of these is the ladybird or ladybug beetle which may be purchased in bulk from most gardening and farming equipment suppliers, or even from Amazon. Also known for their appetite for aphids are hoverfly larvae and green lacewings. Lacewing eggs may also be purchased, however hoverflies will need to be drawn into your garden naturally. Do this by planting fragrant herbs such as garlic, catnip, and oregano whose flowers attract these tiny predators. You can also grow herbs like clover, mint, dill, fennel, and yarrow around your garden to naturally attract ladybugs and lacewings.
8. Bug-eating Birds
Another method for natural aphid control is to encourage the nesting of birds such as wrens, chickadees, and titmice around your garden. The best way to attract these delightful aphid-devouring predators is to offer them free food and housing space. These birds prefer to nest in small trees and twiggy shrubs that provide good cover. Try planting hydrangeas, abelia, and other shrubs with dense foliage in which birds can hide from predators. Evergreen bushes and trees like boxwoods, arborvitae, and privet are also excellent choices for attracting birds that prey on aphids.
Small birdhouses specifically designed for these species are another great option.
Also, while it may seem counter-productive, put out a feeder designed for small birds and fill it with seeds that attract small birds. Black oil sunflower seeds, pre-hulled sunflower seeds, nuts and nut hearts are all good choices. Birds who come for the seeds will most likely stay to dine on your aphids!