Put it into a gallon of water and add 1 tablespoon of biodegradable Detergent. Let it sit for a day, then strain and spray. Also, planting parsley around your roses will help keep aphids away. Anon My garden fish pond has thread algae clogging it up very badly. I heard that rotating a rough barked stick will get it out.
Caffeine is a naturally occurring herbicide.
Large drinking water bottles are particularly good for larger plants. If you have an aquarium, save the water each time you change it and water your house plants with it. You'll be amazed at the results. Make sure that cables run behind lawnmowers, you must never cut towards a flex, or use it in wet conditions. Never wash electrical gardening equipment with water.