Your zip code makes this choice for you. Crabapple (Malus sylvestris) is a zone 4-8 tree that needs six to eight weeks below 45°F to flower at all; pomegranate (Punica granatum) is a zone 8-10 tree that needs a hot summer to flower at all. There's a narrow band around zone 8 where both work, and outside it, one of them is the wrong tree.
Both hold real fruit on a small tree, which is rarer than it sounds. Crabapple sets marble-sized red or yellow apples that hang on bare branches into December. Pomegranate sets miniature fruit that ripens on the tree after a summer of orange-red tubular flowers, and its leaves go gold before they drop.
The fuss is similar in volume and different in kind: crabapple brings apple scab and fire blight, pomegranate brings basal suckers and brittle wood. Both live outside, full stop.
| Attribute | Crabapple | Pomegranate |
|---|---|---|
| Difficulty | Intermediate, disease watch | Intermediate, needs heat |
| Environment | Outdoor, cold climate | Outdoor, warm climate |
| Light | Full sun, 6+ hours | Full sun, 6-8 hours |
| Water | Keep consistently moist | Moderate, let top dry |
| Growth Rate | Moderate grower | Moderate grower |
| Mature Size | 10-24 inches | 8-20 inches |
| Best Styles | Informal upright, forest, cascade | Informal upright, literati, root-over-rock |
| Price Range | $20-60 starter | $15-30 starter |
Climate is the first and last question. Crabapple is hardy to -30°F in the ground and needs its pot mulched in or moved to a cold frame below about 25°F; without a real winter it won't flower. Pomegranate is hardy to 10°F in the ground and wants the pot sheltered below about 30°F; a zone 7 grower can winter one in an unheated garage. What pomegranate can't fake is summer heat: cool summers mean few flowers and no fruit.
Pruning timing runs backwards between them. Crabapple flowers on short spurs on last year's wood, so you prune right after bloom, pinch long shoots back to three leaves in summer, and save heavy cuts for winter when the spurs are visible. Pomegranate flowers on new wood, so structural cuts in late winter cost you nothing and often buy you more flowers. That one fact makes pomegranate the more forgiving tree to shape.
Cost and household risk both favor pomegranate. A 1-gallon 'Nana' runs $15-30 and is rated safe for pets; a 1-5 gallon crabapple runs $20-60 and is rated toxic to them. Trained trees overlap in price, $60-250 for pomegranate against $80-300 for crabapple, with Japanese imports of either topping $300.
Watering tolerance splits them too. Crabapple wants the top quarter-inch never quite dry, which means daily water in summer, and a missed day while fruit is sizing up drops the crop. Pomegranate waters when the top half-inch is dry, every 1-2 days in summer, and shrugs off brief drought except during flowering and fruit set, when it drops buds just as readily. Neither is a tree you leave over a long weekend in July.
Trunk character comes free with pomegranate and slowly with crabapple. Pomegranate bark flakes reddish-brown, the trunk twists on its own, and old trunks hollow without a carving tool. Crabapple bark is smooth and scars under wire, so you wire during dormancy and pull it before spring growth swells. Both are rated moderate growers; crabapple finishes at 10-24 inches, pomegranate at 8-20.
Disease pressure is a crabapple problem. Apple scab can strip the tree by August, fire blight has no cure beyond cutting 12 inches below the blackened wood, and powdery mildew arrives whenever airflow is poor. Buy resistant cultivars such as 'Callaway', 'Sargent', or 'Adirondack' and water the soil, not the leaves. Pomegranate's list is shorter: spring aphids you hose off, leaf spot from wet foliage, and basal suckers to snap off.
Pick the crabapple if you're in zones 4-7 and want the tree that looks like a tree: spring blossom, marble-sized fruit that hangs into December, and a winter you don't have to engineer. Budget for a resistant cultivar and a fungicide routine.
Pick the pomegranate if your summers are hot and you're in zone 8 or warmer, or you have an unheated garage for winter and want easier pruning and pet-safe fruit. Skip both if the tree has to live indoors: crabapple needs a cold winter, pomegranate needs a hot summer, and neither happens in a living room.
