I figure to use about 1 tbsp per liter of water, but as molasses is thick should I boil it in water? Both to thin it out and possibly break-down some sugers as you would do in brewing beer. Also, how long into flowering and how often? Oh, and this is for an outdoor grow.

Y, go ahead and do that.
you can start giving molasses at any point during actual flowering, i start 1 week after they show sex.

when u say molasses

what kind is it

is it just lyles black treacle

or is it some kind only used for growing

i use billingtons from tesco, looks like brown sugar, i put shit loads (5tsp-ish) into a 1.5ltr bottle of warm water (half boiled, half stood for 3 days) and use from 2nd week of flower every 3-4 days. hope this helps
N.P

I heat filtered tap water in a kettle, let it cool just a bit then pour it over the molasses in a pyrex beaker/measuring cup. This cools more and then gets added to me water jug along with seaweed extract and micro herd powder.

Damn I'm ready a good couple weeks into flowering but it's all good. I'm sure they'll still enjoy it.

Hiya Hess,

I got the 350g Meridian Organic Mollasses last night from tesco, only cost a £1 the missus said.
Can't go wrong for a £1,I will make some up tonight and use it in a day or 2.

Good luck using your Molasses,
GG

so its just treacle? and whats it for can anyone link me to info ? plz ta

try reading this topic. Molasses is used for feeding friendly soil bacteria.