I would make a tea and use that. You can buy a 50 pound bag of alfalfa pellets and use them to ferment in a 5 gal bucket. You can add other handy ferts.

I used a 35 gal tote and lay green weeds down in it. Including new grass hay. filled it up to the top lay down some bricks and filled with water. It turned dark brown water and take some out and add that to the other tea. Add more water. This will keep going most of the summer giving organic liquid ferts.

I use rain water. that is by far the best. I will also add some urine to the final product before use. just go easy.

I also add in some real good compost to the soil. Nothing like it. It will supply nutrients slowly over the entire summer.

You can purchase dry powdered kelp or seaweed very cheap like a dollar a pound. one ounce per 30 gallons is great for micronutrients. Add the alfalfa pellets and you have one powerful fertilizer.

I believe that Super Thrive is simply alfalfa tea.

If you have a cow far go pick up some good manure. add that to your tea. I would not waste money on Yuppie fertilizers. But I do spend a lot on truck loads of manure. I pay $100 for 30 yards of horse manure delivered. That is a real big truck. I also get 10 yards of cow manure for $100. It is dependent on the size of truck the farmer owns. the manure is free. the trucking is $100.

By the way I have had super results from Neptune Fish Fertilizer indoors when things are difficult. For me things go super easy outdoors in my rich garden soil.