Use Old Coffee Grinds in your garden. Tomatoes love it!! They add nitrogen to the soil, boost foliage growth and deter pests. If you don't drink much coffee, Starbucks gives away coffee grounds in their Grounds for Gardens programs.
How To Get Rid Of Gnats 1. Allow plant to completely dry out 2. Sticky trap-coat yellow index car with vaseline 3. Small bowl of apple cider near plant the gnats will be attracted to cider 4. Tobacco over the soil (not on herbs) 5. Killer Soap Spray- 2tbs of soap, 1 gallon water, spray on plant 6. Rubbing alcohol spray- 1c rubbing alcohol, 1 qt water...spray 7. Sand layer over soil