When i used fox farm big bloom, sometimes i would just shake it up and pour some into a gallon jug. No measuring or nothing, i was using more than i was suppose to, i know that for sure. I never had any harmful effects.

I don't like foxfarm ferts anymore, other stuff works better for me.

What fasts102376 seems like the best thing to do thou.

You should discover what is best for your plants. If you have more than one, try different things and see which plant does best, then apply that to all. Use what fasts102376 said as a base, and increase some and lower some from there.

Have fun, good luck