Manure takes more than a year to decompose, so it is suitable for long-term use in gardens, not for containers. For container gardening, you should use potting soil/mix. Can you use compost instead of ...
Maintaining your greens usually depends on how you prepare the soil ... potting mix can hold seven times of its volume in water so gardeners do not have to use much water for 3x bigger size plants.
You can also purchase a pH meter at any garden center to accurately test the pH of your soil. Most green plants get the majority of the nutrients needed for growth and development from the soil ...