What Size Pot for Herbs | Container Depth & Diameter Guide

Most culinary herbs need a container at least 8–10 inches deep, with the diameter ranging from 6 inches for compact herbs like thyme to 12 inches or more for spreading herbs like mint or taprooted types like parsley.

A pot that’s too shallow starves the roots; one that’s too small crowds them and dries out hourly. The right size for your herb depends on which variety you’re growing, whether you’re planting alone or in groups, and where the container lives. Here’s how to match the pot to the plant — without guessing.

Minimum Pot Size by Herb Type

Each herb has different root demands. Shallow-rooted herbs tolerate smaller containers; deep-rooted or spreading herbs need room to stretch.

• Basil: 10–12 inches wide and deep is described as a bare minimum by some sources; smaller basil plants can manage in 6–8 inches of depth. Basil grows quickly and becomes top-heavy, so width matters as much as depth.
• Mint: 10–12 inches wide is commonly recommended because mint spreads vigorously via underground runners. It will fill any container it’s given, so err on the larger side or expect to divide it yearly.
• Parsley: 8–10 inches with useful depth for most varieties. Taprooted parsley may need 12 inches deep or more — it sends a single deep root straight down, and a shallow pot stops it from reaching full size.
• Thyme and chives: Often succeed in 6–8 inch pots if drainage is good. These are among the most container-tolerant herbs.
• Dill and cilantro: Both send down taproots similar to parsley. Aim for at least 10–12 inches of depth for full plants.

Browse our tested herb garden planters for containers sized to each herb type.

General Container Guidelines That Actually Work

Depth matters as much as diameter. ScottsMiracle-Gro says containers should be at least 8–10 inches deep — and for mixed plantings, use 12 inches in diameter for 2–3 herbs or 16–18 inches wide for 3–5 herbs. The safe middle ground: start at 8–10 inches deep and size the diameter to the specific herb’s growth habit.

For indoor pots, NC State Extension notes most herbs can be grown in 4-inch to 6-inch diameter pots — but taprooted herbs still need a 12-inch deep container even indoors. Small pots dry out faster and require more frequent watering, so indoor herb growers should check soil moisture daily.

Why Drainage and Soil Are Non-Negotiable

The best-sized pot fails without drainage holes. Stagnant water rots herb roots within days. Multiple sources stress drainage holes plus a well-draining potting mix — never use garden soil in containers, which compacts and suffocates roots. Use potting mix with added perlite or grit instead.

Light and watering follow naturally from container size: most culinary herbs need 6–8 hours of direct sunlight and watering when the top inch of soil dries, which often means 2–3 waterings per week for typical potted herbs. Smaller pots need more frequent checks; larger containers buffer moisture better.

Common Pot-Sizing Mistakes to Skip

The three most frequent container errors: using a decorative pot without drainage (drill holes or use it as a cachepot only), choosing a pot too shallow for taprooted herbs like parsley or dill (they stop growing at the pot bottom), and crowding too many herbs into a small container. Rule of thumb: one herb per 6–8 inch pot, or a 12-inch-wide container for two compatible species with similar water and light needs. Avoid pairing moisture-loving basil with drought-tolerant thyme in the same pot.

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