A pot that is too small stunts root growth. A pot that is too large holds excess moisture and causes root rot. Our container size matchmaker helps you pick the right size for any plant.
Search by plant name and get specific recommendations for container diameter, depth, material (terracotta, plastic, fabric), and drainage requirements. The tool covers flowers, vegetables, herbs, and houseplants.
Container sizing follows guidance from University of Georgia Extension.
Frequently Asked Questions
What size pot do I need for tomatoes?
Most tomato varieties need a pot at least 18 inches in diameter and 18 inches deep (minimum 15 gallons). Determinate varieties can grow in 14-inch pots. Fabric grow bags work especially well because they air-prune roots.
Should I use terracotta or plastic pots?
Terracotta is porous and dries faster — ideal for plants like lavender and succulents that prefer dry conditions. Plastic retains moisture longer — better for ferns, tropicals, and vegetables that need consistent watering.
How do I know when a plant needs a bigger pot?
Signs include roots growing out of drainage holes, water running straight through without absorbing, the plant becoming top-heavy or tipping over, and slowed growth despite adequate light and fertilizer.