Your question: Just wondering: how often should molasses be applied to garden soil?
could this not attract ants - being molasses are sugar based?
Answer: Tomatoes need a steady supply of energy and will not produce well under conditions of too much then not enough of water or anything else !
An application of molasses may benefit the tomatoes under certain conditions?
If the soil is low organic matter soil and has been mulched with mulch that has a high Nitrogen to Carbon ratio, one may apply a very lite amount of molasses along with water to keep the mulch soaked and cause the plant to take in more Nitrogen ! Too much Nitrogen can Cause NO blossoms to set !
But, if too much BSM is used each time it may temporarily stop the flow of Nitrogen into the plant?
By adding BSM to the soil in very small amounts one can Cause the bacteria in the soil to produce Hugh amounts of Nitrogen for the plants growing, if one has Live Soil with bacteria ! This can be Good or Bad depending if the plants need this extra Nitrogen and if the plants can get enough of the other needed Alkaline Minerals to match this amount of Nitrogen?
Using BSM to feed plants and have Success will require one to learn how the plant you are trying to grow will react to the application !
For plants have growing cycles needing Nitrogen in Balance with the Alkaline Minerals taken in !
Smile Tis your choice.