The potting bench
Measure the planter before you open the bag.
A balcony gardener’s notebook for the space roots actually occupy. Measure window boxes, allow for tapered pots and work out how much fresh mix a transplant needs.
Open the calculator
From the notebook
The field guides
- Guide 01
How many liters of soil does a window box hold?
Use inside dimensions, the watering gap and the reservoir floor to decide how many bags a group of window boxes needs.
- Guide 02
How much potting mix fits a tapered round planter?
Use two diameters and a fill height to estimate a flowerpot’s capacity without counting the corners of an imaginary cylinder.
- Guide 03
How much new potting mix do you need when repotting?
Subtract the root ball you actually keep, estimate the uncertainty and combine several transplants into one practical shopping total.