πΏ Product Review
Best Seed Trays and Propagators UK 2026
Starting seeds indoors gives you a head start on the growing season, but the right tray or propagator makes the difference between healthy seedlings and a tray of mould. We compared six popular options across budget, heated, and unheated categories to find what actually works for UK growing conditions.
Key Takeaways
- Best heated propagator: The Garland FAB 4 Electric Propagator maintains consistent warmth for reliable germination at under Β£9.
- Best budget seed trays: The YAUNGEL 6-Pack 72-Cell Trays give you 432 cells for under Β£9, ideal for bulk sowing.
- Best unheated propagator: The Stewart 52cm Non-Electric Propagator is a simple, sturdy option for windowsill growing.
- Best for root disturbance-free planting: The Jiffy 7 Pellets let you plant the entire pellet into the ground.
- Heated vs unheated: A heated propagator is worth it if you start seeds before April or grow warmth-loving crops like tomatoes and chillies. For hardy summer sowings, a basic tray with a clear lid does the job.
Related: Best Herb Garden Kits UK Β· How to Take Plant Cuttings Β· Seeds vs Plug Plants
Quick Picks
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Quick Comparison
| Product | Type | Heated | Cells/Capacity | Best For |
|---|---|---|---|---|
| Garland FAB 4 | Electric propagator | Yes (10W) | 4 seed trays | Year-round sowing |
| EarlyGrow Heated | Electric propagator | Yes (50W) | 2 trays + extenders | Tall seedlings |
| Stewart 52cm | Unheated propagator | No | 1 large tray | Windowsill growing |
| YAUNGEL 6-Pack | Seed tray set | No | 432 cells (6x72) | Bulk sowing |
| Nutley's 40-Cell Inserts | Modular inserts | No | 240 cells (6x40) | Plug plant production |
| Jiffy 7 Pellets | Peat pellets | No | 100 pellets | Root disturbance-free |
In-Depth Reviews
Garland FAB 4 Electric Propagator
Heated electric propagator | 10W base | 38 x 24 x 17.5 cm | Vented lid
The Garland FAB 4 is a compact heated propagator that fits four standard seed trays on a single low-wattage heated base. The 10W element maintains a temperature around 18-20Β°C above ambient, which is enough to speed up germination for most UK vegetable seeds without running up your electricity bill. The vented lid lets you control humidity, which matters more than most people realise - too much moisture and you get damping off, too little and seeds dry out before they germinate.
At roughly Β£25-30, it sits in the sweet spot between cheap unheated trays and expensive thermostat-controlled units. Amazon purchasers report reliable germination for tomatoes, peppers, and herbs, and note the lid hinge can feel stiff after a few months.
- Low running cost (10W)
- Fits 4 standard seed trays
- Vented lid for humidity control
- Consistent even heat distribution
- No thermostat control
- Lid hinge can stiffen
- Trays not included
EarlyGrow Heated Medium Propagator
Heated propagator | 50W element | 38 x 24 x 40 cm | 2 vented height extenders
The EarlyGrow steps up from the Garland with a 50W heating element and two height extender sets that give you 40cm of vertical space. That extra height matters once seedlings break through - you can keep the lid on for warmth without the leaves pressing against the plastic. The 50W element brings the compost to temperature faster, which matters in a cold UK greenhouse or unheated spare room in February.
This is the propagator to choose if you grow tall crops like tomatoes, peppers, orrunner beans from seed. The height extenders stack in stages so you can raise the lid as seedlings grow. Amazon purchasers highlight the sturdy build quality, though a few note the power cable is short at around 1 metre.
- Height extenders for tall seedlings
- 50W heats up quickly
- Sturdy construction
- Made in the UK
- Short power cable (~1m)
- Higher running cost than 10W units
- Bulkier footprint
Stewart 52cm Non-Electric Propagator
Unheated propagator | 52 cm long | Clear vented lid | Black base
The Stewart 52cm is a no-frills unheated propagator that does exactly what it promises. The clear vented lid traps humidity and warmth from the surrounding room, creating a sheltered microclimate for seeds. At 52cm long, it fits a standard seed tray plus a bit of extra room, and the ventilation slots in the lid let you reduce humidity as seedlings establish.
ForUK gardeners starting hardy crops like lettuce, broad beans, or calendula in March and April, this is all you need. It costs under Β£9.25 and requires zero electricity. Amazon purchasers praise the lid fit and drainage, though a few mention the plastic feels thin compared to premium options. Read our full guide to taking plant cuttings for more propagation tips.
- Under Β£10
- No electricity needed
- Vented lid
- Lightweight and portable
- No heating element
- Plastic feels thin
- Only fits one tray
YAUNGEL Seed Trays 6-Pack (72 Cells Each)
Seed tray set | 6 trays x 72 cells | 0.8mm thickened PVC | Clear lids with adjustable vents
At roughly Β£9.99 for six trays with lids, the YAUNGEL set is the best value option for anyone sowing in bulk. Each tray has 72 cells, giving you 432 individual planting spots across the full set. The 0.8mm PVC is noticeably thicker than the 0.5mm disposable trays you find in garden centres, and the adjustable vent windows let you control airflow without removing the entire lid.
This is the set to buy if you're raising plug plants for a vegetable garden, starting wildflower seeds, or growing herbs for the kitchen. The trays stack neatly when not in use, and the clear lids double as mini-greenhouses. Amazon purchasers report good results with everything from chillies to wildflowers, though some note the cell depth is shallow at around 4cm - fine for most seeds but not ideal for deep-rooted crops.
- 6 trays for under Β£9
- Thick 0.8mm PVC
- Adjustable vent windows
- Stackable for storage
- Shallow cell depth (~4cm)
- No drainage holes in base tray
- Lids can be loose-fitting
Nutley's 6 x 40-Cell Seed Tray Modular Inserts
Modular inserts | 6 trays x 40 cells | British made | Fits standard 40 x 30cm trays
Nutley's makes these in the UK, and the quality shows. Each 40-cell insert sits inside a standard seed tray (sold separately) and gives you clean, uniform plugs that transplant easily. The individual cells have drainage holes and slightly tapered walls, which makes it straightforward to push seedlings out without tearing roots.
These are the inserts of choice for anyone growing plug plants for transplanting into the garden or allotment. The 40-cell layout gives each seedling enough room to develop a decent root ball before planting out, unlike the crowded 72-cell trays where roots can become tangled. Read our guide on seeds vs plug plants to decide which approach suits your garden.
- British made
- Individual cell drainage
- Clean transplanting
- Fits standard trays
- Outer tray not included
- Only 40 cells per insert
- Higher cost per cell
Two Wests & Elliott Jiffy 7 Pellets (100 Pack)
Peat pellets | 42mm diameter | 100 per pack | Biodegradable netting
Jiffy pellets take a different approach to seed starting. Each compressed peat disc expands to roughly 42mm when soaked in water, creating a self-contained plug of growing medium. You sow directly into the top, and when the seedling is ready, you plant the entire pellet into the ground without disturbing the roots. The biodegradable netting breaks down in the soil within weeks.
This method works particularly well for larger seeds that don't like root disturbance: courgettes, squash, beans, and sweet peas. For fine seeds like carrots or lettuce, the shallow surface and compact peat disc make it harder to achieve even sowing. Amazon purchasers report good germination rates, though a few note the pellets can dry out quickly on a sunny windowsill and need regular monitoring.
- Zero root disturbance on planting
- Biodegradable netting
- 100 pellets per pack
- Good for large seeds
- Dries out quickly
- Not ideal for fine seeds
- Single-use (not reusable)
How to Choose the Right Seed Tray or Propagator
Picking the right seed-starting setup depends on three things: what you're growing, when you're starting, and how much space you have. Here's what matters.
Heated vs Unheated
A heated propagator is worth the investment if you start seeds before April or grow warmth-loving crops like tomatoes, peppers, and chillies. The consistent 18-25Β°C temperature range improves germination speed and success rates, especially in a cold UK spare room or unheated greenhouse. If you only sow hardy summer crops like lettuce, beans, and calendula from March onwards, a basic unheated tray with a clear lid does the job at a fraction of the cost.
Tray Size and Cell Count
Standard seed trays measure roughly 38 x 24 cm and fit most windowsills and heated propagator bases. If you're starting a few varieties for a patio garden, one or two trays suffice. For allotment growers raising plug plants in bulk, a set of 6-10 trays gives you the flexibility to stagger sowings across several weeks, which avoids the dreaded "everything ready at once" problem.
Reusable vs Disposable
Thicker plastic trays (0.8mm or above) can be washed and reused for several growing seasons. Thin disposable trays crack after one or two uses, especially when you're prying seedlings out. The upfront cost difference is small, but it adds up over three or four years. Always wash trays with diluted Jeyes Fluid or bleach between uses to prevent disease carryover.
Peat Pellets vs Traditional Compost
Jiffy pellets and similar compressed-peat products offer the cleanest transplanting experience - no root disturbance, no mess. They work well for larger seeds and crops that resent root disturbance. For fine seeds, shallow-sown varieties, or anything you need to prick out and pot on, traditional seed compost in a standard tray gives you more control.
Frequently Asked Questions
Final Verdict
For most UK gardeners, the Garland FAB 4 Electric Propagator hits the sweet spot: it's affordable, uses minimal electricity, and gives you enough heated space for four trays of seeds. If you're on a tight budget or only sow hardy summer crops, the Stewart 52cm Unheated Propagator does the job for under Β£10. And if you're raising bulk plug plants, the YAUNGEL 6-Pack gives you the best value per cell.
The right propagator won't make you a better gardener, but the wrong one will waste your seeds. Start with what matches your growing ambitions, upgrade when you outgrow it, and wash everything between seasons.
Sam Baker
Garden Tools Writer, MyLushGarden
Sam writes about garden tools and equipment. He has used and broken enough strimmers and secateurs to know which specs matter.
Last reviewed: August 18, 2026 Β· Evidence-based review Β· Contains affiliate links