Yes. An urban planter box can be an excellent home for blueberries, but it is not simply a matter of filling the box with ordinary garden soil. Blueberries are ericaceous plants that need consistently acidic soil—usually a pH of 4.5 to 5.5—plus excellent drainage, steady moisture, and enough root space. If you can manage those conditions, a planter box can work very well, especially for compact or dwarf varieties.
Start with the box itself. Choose a planter with drainage holes and a depth of at least 45–60 cm (18–24 in); a volume of roughly 20–30 gallons per mature plant is a practical minimum. If the box is open to the ground and your native soil is alkaline, consider a liner or root barrier so roots do not escape into unsuitable soil. Fresh concrete can raise pH as it cures, so line concrete planters or allow them to weather first. Untreated wood is usually a good choice, and a food-safe liner can protect the wood and reduce pH drift.
The growing mix is the key. Use an ericaceous or acidic container mix based on peat moss, pine bark fines, and perlite or coarse bark for drainage. Avoid ordinary loam, mushroom compost, manure, or mixes containing lime. Test the pH before planting and again each season with a reliable soil pH meter or test kit. If the pH creeps up, elemental sulfur can lower it slowly, following the label rate; acid-loving fertilizer can also help. Do not guess—blueberries show yellowing leaves and poor growth when the pH is too high.
Water and fertilizer need care in an urban setting. Rainwater is ideal because tap water in many cities is alkaline and adds salts over time. Keep the mix evenly moist but never waterlogged; blueberries have shallow fibrous roots and suffer in both drought and soggy conditions. Mulch with pine bark to conserve moisture and suppress weeds. Use a fertilizer formulated for acid-loving plants, ideally one that supplies ammonium nitrogen, and avoid nitrate-heavy feeds or lime-containing products. In hot, reflective urban sites, provide afternoon shade and wind protection; in cold climates, insulate the box or move it to a sheltered spot.
Choose compact varieties such as Sunshine Blue, Top Hat, Northblue, or other dwarf and half-high blueberry cultivars. For better pollination and larger crops, plant two different cultivars that bloom at the same time. Prune lightly to remove weak or crowded growth, and protect ripening fruit from birds with netting if needed. Expect some trial and error: planter boxes dry out faster than garden beds, and pH can drift, so check moisture and pH regularly.
In short, yes—you can use an urban planter box for acid-loving plants like blueberries, provided you treat it as a managed acidic container system. Use acidic mix, drainage, rainwater, compact varieties, and regular pH testing, and you can enjoy a productive blueberry planter even in a small urban space.