How can I check whether a pot is cracked before reusing it?

Start with the pot empty and in good light. Brush off loose soil so it doesn’t hide the surface, then turn the pot slowly and inspect the rim, outer walls, base, and the area around each drainage hole. Look for a line that continues across the surface, a gap, a chipped section that leaves an edge unsupported, or pieces that move when you handle the empty pot gently.

Check the inside too, especially if the outside has a mark you can follow. A surface mark may be hard to judge by appearance alone, so don’t assume every line is a crack—or assume a doubtful one is harmless. Container materials vary in durability: UC Agriculture and Natural Resources notes that terracotta and ceramic can break, concrete may crack, and plastic can become brittle over time. [S1]

Consider two practical questions: does the pot sit steadily, and can it hold water as intended? Set the empty pot on a level surface and see whether it rocks or leans. Inspect the base and sides for a crack that appears to pass through the material, and check whether water could escape through a damaged spot rather than the intended drainage holes. Keep drainage holes open; UC ANR recommends checking that they are not blocked. The source also identifies drainage and stability as relevant considerations, including the effect of a top-heavy plant. [S1]

This is a visual check, not a definitive test. The source does not give a crack-detection procedure or establish how much damage a particular pot can tolerate. If the pot’s condition remains uncertain, replacing it is the cautious choice.

Treat that as an example to inspect more closely, not as a diagnosis. With the pot empty, follow the line from both the outside and inside if accessible. Note whether it reaches an edge, drainage hole, or another visible crack; whether you can see a gap; and whether the pot rocks or has a loose piece. Avoid putting a planted or heavy pot at risk just to see what happens.

For instance, a reusable note might say: “Ceramic pot; thin line on lower side, about [location]; visible inside: [yes/no/unclear]; gap or loose piece: [yes/no]; rocks on level ground: [yes/no].” If you can’t decide whether the line goes through the pot, or stability or water containment seems doubtful, don’t reuse it for a plant that depends on a stable, water-holding container. Choose another pot instead.

Use this checklist for the empty pot:

1. Clean enough to see: Remove loose soil and inspect in bright light.
2. Check all sides: Look over the rim, inside and outside walls, base, and drainage-hole area.
3. Note signs of damage: Record cracks, gaps, missing pieces, loose fragments, or a line you cannot confidently assess.
4. Check stability: Set it on a level surface and note whether it rocks, leans, or has an unsupported edge.
5. Consider water containment: Ask whether damage might let water escape somewhere other than the drainage holes.
6. Choose conservatively: Reuse only if it appears intact and stable for your intended use. Replace it if it is unstable, visibly damaged in a consequential area, or its condition is uncertain.

A short record can help if you compare several pots: “Pot [label]; material [if known]; damage [location and description]; stable on level surface [yes/no/unclear]; water containment concern [yes/no/unclear]; decision [reuse/replace].”