Weed-Ex is a product that kills/prevents weeds in IC2 crops. Its major ingredient is Grin Powder, made from macerating spider eyes, which are poisonous. Weed-Ex can be useful but, if you cannot stay and watch crops breed, it will permanently hurt the stats of crops it is used on when used too much.
Adverse Effect on Crops
Weed-Ex is known to hurt crops when used too much. The fact that it can help make large amounts of crops may make up for otherwise lax individula harvests. The exact effects over time and with usage have not been found. If you have data on this, please put it here.