Pro-MIX (organic vegatable and Herb mix) says it feeds up to 3 months... .30/.05/.10 NPK. question is, should I wait to feed w my TechnaFlora Nutrients or is it ok to start?
If you have or can get your hands on a PPM meter, you could measure the nutrient concentration of the runoff water and use that to give you an idea. Another idea would be to buy a soil test kit online or at a garden center.
Depends on weather you are growing from seed or clone. Clones will grow and grow roots faster so they will need fed sooner. If you are starting from seed then the pro mix should be good for at least the first month and a half.