Pots split two ways: material (plastic, ceramic, fabric) and volume in gallons (1, 3, 5, 7, 10, and up). Material changes watering. Gallons change which plant will finish a crop.
Fill containers with potting mix, not garden soil. Start with the potting mix calculator so you buy bags once. Nursery “#5” plastic pots can hold less than a 5-gallon bucket or grow bag — measure if the plant looks cramped.
Fabric grow bags are the nonwoven bags sold in gallon sizes. Ceramic includes unglazed terracotta (dries fast) and glazed pots (hold water more like plastic).
Light, cheap, holds moisture
Best for: Herbs, lettuce, and anything that hates drying out on a hot patio
Advantages
Tradeoffs
Check two inches down. Plastic stays wet longer than fabric after the same rain.
Heavy, decorative; terracotta dries faster than glazed
Best for: Herbs and peppers you will not drag around; glazed pots for plants that want even moisture
Advantages
Tradeoffs
Terracotta needs more frequent water than plastic. Glazed ceramic is closer to plastic.
Nonwoven bag; air-prunes roots, dries fast
Best for: Tomatoes, peppers, and potatoes when you can water often, or in a humid climate
Advantages
Tradeoffs
Expect to water more often than plastic. Mulch the surface. Do not use garden soil — it packs in fabric.
Smaller than 1 gallon is fine for seedlings and a single herb. Larger than 20 gallons starts to act like a small raised bed.
| Pot size | A reasonable crop |
|---|---|
| 1 gal | Basil, parsley, thyme, chives, lettuce, green onions |
| 3 gal | Peppers, chard, kale, bush beans, a patio / determinate tomato |
| 5 gal | Determinate tomato, eggplant, trellised cucumber, a comfortable pepper |
| 7 gal | A larger tomato, two peppers, or a compact zucchini |
| 10 gal | Indeterminate tomato with a cage, potatoes in a grow bag |
| 15 gal | Indeterminate tomato that you intend to keep all season |
| 20 gal | A small patio mix, or potatoes you will hill as they grow |
Comfortable sizes for a full season — not the smallest pot a seedling will survive in. One plant per pot for tomatoes, peppers, eggplant, cucumber, and zucchini.
| Plant | Pot size | Material | Notes |
|---|---|---|---|
| Herbs (basil, parsley, cilantro) | 1–2 gal | Plastic or glazed ceramic | One plant per small pot, or a 3-gal mix of three herbs. Cilantro bolts in heat — afternoon shade helps. |
| Thyme, rosemary, oregano | 1–3 gal | Terracotta or fabric | They like the mix to dry a little. A constantly soggy plastic pot is the usual kill. |
| Lettuce, spinach, green onions | 1–3 gal | Plastic | Shallow roots. A wide bowl works. Keep even moisture so leaves do not turn bitter. |
| Peppers | 3–5 gal | Plastic or fabric | One plant. 5 gal is more comfortable in heat. Do not crowd two peppers in a 3-gal bag. |
| Determinate / patio tomato | 5 gal minimum | Fabric or plastic | Cage or stake. A 3-gal pot will fruit, then stall in July. |
| Indeterminate tomato | 10–15 gal | Fabric grow bag | Needs a real cage. 5 gal is too small for a full-season vine on a patio. |
| Eggplant | 5 gal | Black plastic (warm roots) | One plant. Heat lovers like a pot that warms; do not let it cook dry. |
| Cucumber | 5 gal | Fabric or plastic | One plant, trellis behind the pot. Bush types are easier than long vines. |
| Bush beans | 3–5 gal | Plastic | Several plants in a wide pot. Pole beans need a trellis and more mix. |
| Kale, chard | 3–5 gal | Plastic or fabric | One or two plants. Deep enough that summer heat does not cook the roots. |
| Zucchini / summer squash | 7–10 gal | Fabric | One plant only. These are thirsty and sprawl. A 5-gal pot is usually too small. |
| Potatoes | 10 gal grow bag | Fabric | Start with a few inches of mix, hill as vines grow. Do not use a sealed ceramic crock with no drainage. |
| Carrots | Deep 3–5 gal | Plastic (deep) | Depth matters more than gallons. Need a loose column; skip fat terracotta bowls. |
| Strawberries | 3 gal or a wide planter | Plastic or fabric | Wide and shallow beats a tall skinny pot. Refresh mix after a couple of seasons. |