[Kelp]
At the moment I have this stuff:
http://www.groworganic.com/maxicrop-...xtract-lb.html
(You mix it at 2/3lb (10.7 oz) to 1 gallon of water to make a liquid
concentrate, then dilute that at 1/2 teaspoon to 1 tablespoon per
gallon to use it, depending on how big the plants are, whether you
are foliar feeding or soil drenching, what kind of crop, etc. The
instructions that come with it are sized for farmers, like "gallons
per acre" and "dilute to 1:100" or "quart to 50 gallons" for transplanting,
and so on.)
I have also used this:
http://www.groworganic.com/pvfs-liquid-kelp-gallon.html
(1-2 tablespoons per gallon; easy to use, but I did not see
why I should pay the shipping on a gallon of mostly water.)
And this:
http://www.hydroponics.net/i/133676
(Used to be "Algamin Kelp Meal", bought out by Maxicrop. Some growers
probably recognize the box, even though the name of the product is
changed.)
This brand has been recommended for particularly good results:
https://www.saltwaterseaweed.com/sto...&product_id=53