Yes—if the planter box is deep enough. Carrots are root crops, so the container must hold the edible root plus enough loose soil below it. For most standard carrots, choose a planter box with at least 12 inches (30 cm) of internal soil depth; 15–18 inches (38–45 cm) is better for longer varieties. Short or round carrots can manage in 8–10 inches (20–25 cm), but shallower boxes often produce stunted or forked roots. A typical shallow urban planter box may not be deep enough, so measure the actual soil depth rather than the outside height. Make sure the box has drainage holes, fill it with loose, stone-free soil, keep it evenly moist, and thin seedlings so roots have room to develop. If your box is only 8–10 inches deep, grow short varieties such as Paris Market or Little Finger; if it is 12 inches or deeper, standard carrots can work well.
Is there an urban planter box deep enough for carrots?
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