Excessive growth of aquatic weeds is something most pond owners are forced to deal with sooner or later. Because most ponds are dug in low areas they are a natural catch basin for runoff. Over time the nutrients and fertilizers that are carried in by the runoff cause excessive weed growth. Chemical control of aquatic weeds is currently the most effective way of dealing with these problems.

Unfortunately, no single product will control all types of weeds. Instead, proper identification of weeds is necessary so the proper product can be used. Usually one or two weeds will be the thickest is the pond and they should by treated first. If there are other types of weeds left after treatment they can by dealt with of left if they're not too thick. Some weed cover is good for fish structure. After identifying your weeds proper dosages and application are important. Most products need to reach a certain concentration to be effective and under applying will provide poor results. Also, how chemicals are applied can effect the results. Treatments should not be made after a heavy rain or any time the pond has been stirred up. Wait until the water settles before applying. Best results are obtained by treating on a sunny morning so as the pants draw in the sunlight they also draw in the treatment.

All of the products we sell for weed treatment are safe to use with fish. Fish kills can result however if excessive product is used or from an oxygen depletion as a result of the dying weeds. In most cases if the chemical is going to harm the fish it will occur soon after treatment is applied. If the fish react after a couple of days then its usually a result of oxygen loss. Treat small amounts of the pond at a time to prevent oxygen depletion or have an aeration system running to be safe. (Usually treat 1/4 to 1/3 of the pond at one time).

The regular use of an aeration system and/or the use of pond bacteria help to decay the heavy muck layer which usually results from years of decaying weeds, leaves, etc.

The use of safe chemicals is still the best way to keep your pond or lake from becoming infested with aquatic weeds.


Emergent Weed Control





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4385 East 110th Street | Grant, MI 49327 | Ph: (800) 448-3873 | Fx: (231) 834-5537