Please, please, please cover your cans, after the rain! This will not only prevent debris from clogging your pipes and evaporation losses. Still water is a great place for mosquitoes to lay their eggs. No still water please! Don't make your back yard a haven for mosquitoes. ... View related article.
If you cut the bottom of the bottle off (which is now the top, since it is inverted) and leave it uncovered, it is a great place for mosquitos to lay their eggs and increase their population. Don't let your backyard be a disease haven, remove all containers that will hold still water for more than 2-3 days (tires, recycling, garbage cans, buckets, etc.) Rainwater is great for plants yes, but cover these containers after the rain please! Just say "no" to West Nile, etc. ... View related article.