How to Use Biodegradable Planting Pots | Seed Starting Success

Use biodegradable pots by pre-moistening pot and soil, planting seeds at packet depth, watering from the top only, and burying the rim completely or cutting slits before transplanting to prevent root binding and moisture wicking.

Biodegradable pots remove transplant shock because roots grow straight through the walls instead of circling inside plastic. The fix is knowing exactly how to prepare, fill, and bury them.

What Are Biodegradable Pots Made Of?

Biodegradable planting pots are pressed from natural fibers that break down in garden soil. Common materials include peat, coconut coir, paper, cardboard, and DIY pulp from soaked cardboard or newspaper. Each material behaves differently: peat is durable but tends to mold if kept constantly wet, while paper dissolves within about four weeks of ground planting and holds up for three months in a greenhouse. Coir handles water better than paper but dries out quicker in warm sun. Cardboard needs slits cut in the base to fold tabs for a bottom, and it dissolves fast once buried.

For most spring seed starting—four to six weeks before your last frost date—paper or coir pots strike the best balance of durability and breakdown. DIY options from newspaper, toilet rolls, or egg cartons are free but less uniform.

How To Prepare And Fill The Pots

Preparation determines whether the pot helps roots or fights them. Check drainage holes—poke extra if needed. Spray the pots with water or briefly dunk them in warm water so they don’t wick moisture away from the soil later. Moistened pots also hold their shape better during filling.

Use a seed-starting mix that’s already damp—not muddy, but moist enough to clump when squeezed. Fill each pot, press the soil down firmly, and leave a quarter-inch gap at the top. Follow the seed packet for depth: tiny seeds often need just a dusting of soil, while bigger seeds like squash go deeper. Sow one or two seeds per pot. Water from the top only with a gentle spray; bottom-watering peat pots is a known mistake that causes rot. Cover the cells with clear plastic or paper to trap humidity until germination.

If you’re buying pots instead of making them, check out our tested picks for biodegradable seedling pots that handle moisture consistently and break down on schedule.

Transplanting Without Damaging Roots

This is where most people make the mistake that costs them the seedling. Instead, dig a hole wide and deep enough to set the whole pot below ground level. Cover the rim completely with soil—if any part sticks above the surface, it acts like a wick and pulls moisture out of the root zone. For pots with tall edges, cut several slits down the sides and around the bottom, or peel away the top rim entirely before planting. For larger pots, splitting the bottom open helps roots escape faster.

Handle the seedling by the soil ball or the leaves, never by the stem—crushing the stem kills the plant. Water in well after transplanting.

Common Mistakes To Skip

Three problems trip up first-timers. Moisture wicking happens when the pot rim sticks above the soil line—the exposed edge pulls water out like a candle wick. The fix: bury the rim or peel it off. Cut slits at transplant time. Don’t crowd pots, and let the surface dry slightly between waterings.

FAQs

Can I put biodegradable pots straight into the ground?

Yes—bury the entire pot below the soil surface. If the rim sticks above ground, cut slits and peel it away or cover the edge with soil to prevent moisture wicking and root restriction.

Do biodegradable pots cause root binding?

Only if buried without cutting or if the seedlings stay in them too long.

Should I remove the pot before planting?

Cut slits down the sides and peel the top edge away if needed, but leave the pot on. The material will break down in soil.