If you are having an weeds problem it is because you are not paying attention to what is causing the problem: 

Over use of chemical fertilizers
      Avoid using chemical fertilizers, pesticides etc., on your property. These things cause imbalance in the biological make up of the soil  ( the bacteria that live in the soil are killed by the fertilizer) and the imbalance causes stress. The stress attracts the weeds. Once ants over flow on your grounds, they will naturally over flow into your garden.

Over use of pesticides
       Instead of spraying pesticides on the weeds, learn to control them! Pesticide applications in time also kill off beneficial bacteria which in turn causes stress in the plants. All stressed plants attract insects especially ants!  Stressed soils attract weeds.

 "Attend to the problems of the soil and you will be able to control the weeds that you have.   By controlling the weeds, you also control various garden diseases and many other types of insects. This is the only long term weeds control solution that works!"
Andy Lopez The Invisible Gardener

   Steps to Natural Weed Control

1. Get Immediate personalized  help with your garden pest/weed or disease problem.

2. Get immediate access to over 8,000 files available in The Organic DataBank™ on organic gardening, natural pest control, natural fertilization, natural tree care, natural rose care, natural lawn care and much more!

3. Get access The Organic DataBank Library of Articles written by The Invisible Gardener.

4. Get access to The Organic Hot Line and Talk Directly with The Invisible Gardener limited to 1 hour free per year.

5. New members get all ebooks (over 20) free as well as current ebook Natural Pest Control.

6. You should join Club IG because you are the type of person that can learn how to do it themselves and with the help of The Invisible Gardeners Organic DataBank, you will be able to access the information as well as resources you will need to do it yourself! Have a problem down the road? The Invisible Gardener will be there to help you.

If you still need help try joining Club IG and getting help from The Invisible Gardener.
Some resources:

Tell em Andy sent ya!

See also Using Natural Soaps