How it works
soil = area × usable depth × 1.18 ÷ 67.2 (dry quarts); plants = area ÷ spacing²
Soil & plants by round container size
Soil & plants by round container size
| Bowl diameter | Depth | Potting soil | Small plugs that fit |
|---|---|---|---|
| 6 in | 3 in | 0.2 dry qt | 3 |
| 8 in | 4 in | 1.3 dry qt | 5 |
| 10 in | 4 in | 2.1 dry qt | 8 |
| 12 in | 5 in | 5.0 dry qt | 12 |
Soil is sold in dry quarts and cubic feet (1 cu ft = ~25.7 dry quarts). Counts assume small 2-inch plugs at 3-inch spacing; pack succulents closer for a fuller look.
Frequently asked questions
How much soil does a fairy garden need?
It depends on the container. A 12-inch bowl 5 inches deep holds about 5 dry quarts of potting soil; an 8-inch bowl needs only about 1.3 dry quarts. Subtract about an inch for a gravel drainage layer and an inch of rim.
How many succulents fit in a 12-inch bowl?
Packed root-to-root, about 28 small succulents fit in a 12-inch round bowl; spaced to grow, around 12–16. For a lush instant look, plant them close — succulents tolerate tight quarters.
Do fairy gardens need drainage?
Yes. Use a pot with a drainage hole and a 1–2 inch gravel layer on the bottom, plus a fast-draining cactus/succulent mix. In a sealed container, add a layer of activated charcoal and water sparingly.