Molasses

Its nice to add liquid molasses a little early, just when the first pistils begin to show...this give the molasses time to form a homeostasis with the soil. Molasses does nothing for plants in and of itself. What Molasses does is feed the microbial life in the soil helping to create a natural microbiome within your growing medium (soil is best) which creates a healthy ecosystem for your plants to then benefit from...again molasses does not make your weed stronger or bigger..it feeds the soil...the soil then..in turn feeds the plants. I premix dry sugar beet molasses into my soil along with another 24 different and organic secret herbs and spices right from the start before I plant. Remember also, if you are using chemical fertilisers molasses won't do anything because the chemicals will burn all natural life from the medium - No nematodes, no healthy enzymes no fungus no nothing - just chemical steroids. If you are organic, molasses is great for improving overall soil quality. Hope that helps. Sticky Buds!

If the question is "when" then I'd say you can start it next week, when they should be in flower... Good luck!

Best option is powdered, that way its water soluble and has 0 chance of attracting pests or causing issues. Adding it in syrup form cut a small hole with a spoon 3-4inches from stem and fill her up, plant will love it. Tis also nice to heat it up slightly before pouring it in will help with absorption bit not required.