cubic feet of soil for 25′ ivy vine
I have planter boxes which will be planted with Hedera helix, Ivy. How many cubic feet of soil does each plant need as it grows to the top of the wall: 25'? What should the spacing between the plants be?
You will need to have measurements of the window boxes to determine the amount of potting soil.
Your local garden center should be able to help you calculate the amount.