Avoiding Spare Chemicals
One way is to avoid mixing more than you need if you are diluting things like weed killers or even fertilisers (too much can be as bad as none at all). Have a watering can or jug set aside for mixing such sprays. It’s easier to mix more than to wonder what to do with too much. This saves the problem of looking for something else to use your mixture on or tipping it on some bare soil where it could cause problems to you later on (or just be plain bad for the soil!).
Disposing of empty containers
Empty pesticide and weedkiller containers which have held concentrated liquids (those requiring dilution before use), should be rinsed three times, adding the washings to the final spray solution. You can then dispose of the containers in your normal household waste bins (yes take them home, no-one wants to inherit a collection of rubbish or buried containers when taking over a new allotment).
Disposing of surplus chemicals
If you buy well this should not be a problem as you will not have surplus material. Buying too much is bad for your purse so you should think about how much you need before you buy not how to dispose of it afterwards!
Never dispose of surplus pesticide or weedkiller down drains or in watercourses as this leads to all sorts of problems somewhere else! If disposal is unavoidable, small quantities should be diluted and sprayed onto permitted plants according to the label instructions.
Disposing of old chemicals
With the recent withdrawal of many garden chemicals, gardeners may possess surplus stocks of pesticides that they are legally not allowed to use. When pesticides are withdrawn from the market for economic reasons there is usually a two-year grace period in which to use up remaining stocks. There is a long list of such chemicals here on the RHS website.
Again, if you have a lot of left over chemicals at the end of the season, it does suggest that you have not been wise with the spending of you budget.
You can find much useful information here on disposing of garden chemicals. Just remember how many accidents occur in the home that could be prevented if we thought about our use of chemicals – and the money that maybe we didn’t need to spend in the first place. Only buy what you need in the way of chemicals if all other routes to solve a problem fail.