I applied the whole bag of 30-0 4 expert gardener fertilizer with iron just before Labor Day at bag rate. synthetic fertilizer this season to the lawn. Traditional fertilizers with weed control do not kill crabgrass. Lawn is liking it all. On top of that fertilizer, it’s a good idea to fertilize every week or two weeks according to the instructions on your fertilizer. Be careful not to over-fertilize! Contact Us It’s standard 10-10-10 granular fertilizer in two big bags. Many of the substances found in a standard fertilizer, including the main nutrients, can actually damage plants if overused. Expert Gardener Fertilizer , Soil & Seeds See All. Like Save Mike McGarvey 2 years ago Follow the directions. Expert Gardener All-Purpose Plant Food 2.0 2 0.0 Best Lawn & Plant Food 5.0 Miracle-Gro Quick Start Liquid Plant Food 3 reviews est. Is it safe to use Expert Gardener's all purpose fertilizer to fertilize my lawn without damaging or burning it out? I'm doing the "standard" fall regime, so I guess the next time I Expert Gardner manufactures good quality electric outdoor products at affordable prices. How to Apply Lawn Fertilizer Using Ironite fertilizer requires