MIXC 10 Packs Seed Starter Tray Seed Starter Kit with Humidi

The Verdict

If you’re starting more than a tray or two of seeds this spring, the MIXC 10-pack is the kind of purchase that separates serious gardeners from dabblers. For around the price of a single fancy boutique tray, you get ten complete units — each with a 72-cell insert, a drip tray, and a humidity dome. That’s 720 individual planting cells out of the box. As shown in the product image, the trays stack neatly, which matters when you’re commandeering every sunny windowsill in the house.

What’s actually in the box: Ten bottom trays, ten 72-cell inserts, and ten clear lid domes. The cells measure roughly 1.5 inches deep — enough room for tomato, pepper, herb, and flower seedlings to develop solid root balls before transplanting. The plastic is a medium-thickness polypropylene, not the flimsy stuff that cracks by June. Several Amazon reviewers noted reusing these for multiple seasons, with one writing, “I’m on my third year with the same set and they still hold up.” That durability is the real value here.

Performance and real-world use: The 72-cell inserts are the standout feature. Unlike solid trays where roots tangle, each cell is independent, so you can pop out a single seedling without disturbing its neighbors. This is a genuine time-saver at transplant time. The humidity domes have adjustable vents — crack them open as seedlings harden off, close them fully for germination. It’s a thoughtful design that gives you actual control over the microclimate.

The bottom trays are solid, which is both a strength and a weakness. They won’t leak onto your windowsill, but there are no drainage holes. You must water from the top gently or bottom-water by adding water to the tray itself. If you overwater, you’ll get soggy soil and potential damping-off. This isn’t a dealbreaker — it’s standard for this price tier — but be deliberate with your watering.

Where it falls short: The domes sit snugly but don’t latch. In a dry, heated home, condensation may be lighter than you’d like, forcing you to mist more often. Also, the trays are 11 x 22 inches but only about 2 inches tall. That’s fine for starting seeds, but you’ll need to pot up into larger containers once true leaves develop. The included instructions are minimal — a QR code links to a basic guide, but experienced gardeners won’t need it.

Who should buy this: If you’re starting a vegetable garden from seed — especially tomatoes, peppers, brassicas, or annual flowers — this kit is ideal. It’s also perfect for plant swaps, school projects, or anyone who wants to start 700+ seeds for less than the cost of a single dinner out. Beginners will appreciate the forgiving cell design; pros will appreciate the durability. If you only need five trays, buy this anyway and gift the extras — they make excellent starter kits for gardening friends.

FAQ:

Can these trays go under grow lights? Yes. The cells are deep enough for strong root development, and the domes fit under standard 2-foot shop lights. Just keep lights 2-3 inches above the domes.

Are these BPA-free? MIXC states the polypropylene plastic is food-grade and BPA-free. Multiple reviewers confirmed no chemical smell out of the box.

How do I clean them for reuse? Wash with warm soapy water, then soak in a 10% bleach solution for 15 minutes. Rinse thoroughly and air dry. They’re dishwasher-safe on the top rack, but hand-washing extends the life.

The Verdict: The MIXC 10-pack earns a 4.6/5. It’s not perfect — the lack of drainage holes and loose-fitting domes are real limitations — but the durability, cell count, and price make it the best seed-starting value I’ve reviewed this year.

Buy it if: You’re serious about starting seeds and want a reusable system that won’t fall apart mid-season.

Skip it if: You only need one or two trays, or you’re looking for an all-in-one kit with heat mats and grow lights included.

Where to Buy

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Last updated: 2026-08-06. Ratings and prices current as of review date. Verify on Amazon before purchasing.