How Much Fertilizer to Use for Annual and Perennial Flowers in Large Containers?
I have planted sun-loving annual and perennial flowers (outdoors) in two large wooden containers: One is 8' x 2' with a depth of 10 inches. The other is 6 feet long, with the other dimensions being the same.
"(for outdoor plants) Mix 1 tablespoon of Miracle-Gro® for every gallon of water. ...For indoor plants, mix 1/2 teaspoon (not tablespoon) per gallon of water. "
Other growing info:
Denver County Colorado
You can use a water-soluble fertilizer at half strength each time you water or at full strength every couple weeks. You want to provide enough fertilizer to grow healthy plants but not so much that they get long and leggy. Watch how them do and adjust accordingly.
Here's some advice from CSU Extension on growing in containers https://extension.colostate.edu/topic-areas/yard-garden/container-gardens-7-238/
Hello again. Thank you for your prompt response, but I am still confused.
Let's go back to my example of the Miracle Gro soluble fertilizer. When talk about using it at "full strength," are you advising 1 TB per gallon or 1/2 tsp per gallon?
You want to follow the label instructions for outdoor plants, and in the Miracle Gro example cited in your initial email, that would be 1 tablespoon per gallon for full strength or 1/2 tablespoon per gallon for half strength.