Fill a spray bottle (under a dollar at most home improvement and discount stores) with water about 3/4 of the way to the top, add a squirt of biodegradable dish soap, and a couple cloves of garlic, minced. Mix it all together, let it sit overnight for greater strength, and spray it on your plants.
How to kill aphids Throw the peel of lemons into 300ml of boiling water and leave to simmer for half an hour or so. Meanwhile, pour the lemon juice into a spray can or a watering can with a rose and spray the affected leaves and stems on your plants. Aphids hate citrus, and will either die or disappear, leaving your plants to recover beautifully.
Garlic Oil Spray Organic gardeners have long relied on garlic as part of their pest-fighting arsenal. Garlic contains sulfur, which, besides being toxic to pests, is also an antibacterial and antifungal agent. The dish soap in this mixture also breaks down the bodies of soft-bodied pests, such as aphids.