fertilizer-nutrients First time using fertilizers. I Bought Miracle gro.

I grow hot peppers at 5 gallon containers. I had never use any fertilizers in container plants.

I bought miracle gro tomato plant food. 18 18 21
Ratio is 1tbsp =1 gallon for outdoor and 2tsp=1gallon for indoors.
My plants are 3ft tall.
I want to use this in my container plants.

Should i use tbps per gallon or 1tsp per gallon?
When watering my container plants should i pour the whole gallon of mixture in a single container plant.
if not, how much should is just pour?
Thank you

Welcome to the forum!

I found this.> SFGATE - Miracle-Gro Instructions

"For most plants, you should mix 1 tablespoon of Miracle-Gro with 1 gallon of water in a watering can. According to Scotts, exact measurements are not critical, so using a little less or a little more is not a concern. This amount of solution will feed 10 square feet of flowering plants or vegetables. Feed them every seven to 14 days during the growing season."
 
Good luck!

I would not use it full strength for plants in containers. IMO no more than half strength for container plants.