How to Use Burpee Seed Starter Kit | Setup That Works

The Burpee Seed Starter Kit works by assembling the self-watering tray, orienting each soil pellet with the flat side up, and adding warm water so pellets expand vertically before planting.

Standing over a tray of tiny soil discs that haven’t risen is a frustrating start to spring. The Burpee self-watering kit skips that failure, but only if you know the three-minute timer trick and the one orientation rule most people miss. Whether you bought the 72-cell greenhouse kit or the smaller reusable version, the process is the same: build the wicking system, expand the pellets properly, plant two seeds per cell, and let the reservoir do the watering.

What Comes With Each Burpee Seed Starter Kit

The self-watering system ships with the same core parts regardless of your tray size. Here is what you will find inside:

Assembling the Self-Watering Tray

Place the two elevation trays inside the bottom water reservoir. Drape the self-watering mat over them, tucking each corner down so the mat touches the bottom of the reservoir where the water will sit. This contact is what draws moisture upward. If you are using a tray from a previous season, soak it in warm water with a splash of soap and vinegar for 15–20 minutes to sanitize it first and prevent damping off.

Why Pellet Orientation Matters (The Most Common Mistake)

Each soil pellet must sit with its flat side facing up. If a pellet is placed on its edge or sideways, it expands horizontally and presses against the cell walls, locking itself in place instead of rising. The result is a half-inch puck where a full cell of loose soil should be. Check every pellet before adding water — turning one takes two seconds, and skipping it means a cell you cannot use.

Expanding the Pellets: Water, Wait, and Mix

Pour warm water slowly into each cell until every pellet is covered. Within a minute the pellets begin rising. Set a timer for 3 to 5 minutes after the last cell is filled — this gives the compressed soil time to fully absorb. If any pellet stays flat, add a bit more water to that cell. Once the time is up, grab the mixing stick and break each pellet apart completely. The goal is loose, fluffy soil, not a lumpy plug. Press the surface gently to level it before planting.

How Many Seeds Per Cell

Plant two seeds in each cell and cover them lightly with soil. This doubles your chance of germination in every spot. After both sprout, snip the weaker seedling at soil level rather than pulling it, so you do not disturb the roots of the stronger one. Use the mixing stick or a Seed Sewer tool to make a shallow dibble hole first.

If you are comparing different systems before buying, the top-rated seed starter kits tested this year include the Burpee model alongside other setups for different budgets and seed counts. That roundup covers which trays hold up best for repeated seasons and which wicking mats actually pull water reliably.

Watering After Planting

Fill the bottom reservoir until there is at least a quarter inch of water sitting in the tray. The mat wicks it upward, so the soil stays moist without you pouring water on top of the seeds. Place the clear dome over the tray to trap humidity. Keep the tray in a warm spot out of direct sunlight until seeds sprout. After germination, remove the dome and move the tray to a bright windowsill or under grow lights. Never let the cells dry out — check the reservoir daily and refill as needed.

Common Problems and How to Fix Them

The wicking mat may not pull water high enough on its own, especially in a dry room. If the top of the cells feels dry while the bottom is wet, pour a small amount of water directly into each cell from above until the mat catches up. Overwatering is the other risk. If roots look brown or mushy, the tray may be holding too much water — let the reservoir go dry for a day before refilling. And never leave seedlings in these trays past the first set of leaves. The SuperSeed pellets contain almost no nutrients, so transplant into nutrient-rich potting soil as soon as roots show through the bottom of the cells.

Transplanting and Storing the Tray

When the first true leaves appear and roots peek out of the cell bottoms, move each seedling to a larger pot with standard potting mix. Lift the whole plug gently — the self-watering mat means roots grow straight down, so they come out in one piece. After transplanting, wash the tray parts with warm soapy water and let them dry completely before storing. A dry tray stays mold-free and ready for next year.

Finishing Strong: The Two-Rule Checklist for Burpee Kit Success

The difference between a tray full of strong seedlings and a frustrating first attempt comes down to two things: pellets flat-side-up before water hits them, and transplanting before the first true leaves stop growing. Orient every pellet. Set a timer after watering. Mix the soil thoroughly. Plant two seeds per cell. Remove the dome at first sprouts. Bottom-water. Move them to real soil on schedule. That sequence works every time.