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Large outdoor planters start at roughly 30 inches in any single dimension, whether diameter, width, or height, and go up from there. At this scale, the planter is no longer an accessory. It's a structural element of the landscape, housing trees, mature hedges, columnar shrubs, or significant focal plantings that the project requires above-ground rather than in-ground.
Soil volume matters at this scale. A 36-inch round fiberglass planter holds roughly 16 cubic feet of soil and accommodates trees up to 6 to 8 feet at planting. A 48-inch extra large trough planter holds 25+ cubic feet, enough for a row of mature boxwoods or a small tree with companion plantings.
Serene Yards stocks large and oversized planters in fiberglass and fiberstone almost exclusively. Concrete or solid stone at this size becomes a freight, install, and structural-load problem: a 48-inch concrete planter full of soil weighs over 1,000 pounds. The fiberglass equivalent weighs roughly 400 pounds full and ships standard freight with lift-gate delivery included.
Use the Planter Size Calculator to determine exact soil volume for the size you're considering.
Soil volume and weight quick reference
| Planter size | Soil volume | Empty weight (fiberglass) | Full weight (wet soil) |
|---|---|---|---|
| 30 in round, 24 in tall | ~9 cu ft | ~25 lbs | ~700 lbs |
| 36 in round, 30 in tall | ~16 cu ft | ~45 lbs | ~1,250 lbs |
| 48 in round, 36 in tall | ~28 cu ft | ~80 lbs | ~2,200 lbs |
| 60 in trough, 30 in tall, 24 in deep | ~25 cu ft | ~70 lbs | ~2,000 lbs |
Wet-soil weight calculated at roughly 75 lbs per cubic foot. For rooftop installs, check load-bearing capacity before specifying. See the rooftop weight guide.
What to plant at oversized scale
Trees: olive, citrus, Japanese maple, fig, fruit trees. Hedges and topiary: mature boxwood, holly, yew, podocarpus. Statement plants: bird of paradise, mature palms, agave americana, large ornamental grasses.