Seed Starting Trays, Domes & Flats | Johnny's Selected Seeds

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Johnny's offers a selection of seed starting trays, flats, and humidity domes to accommodate whatever it is you decide to grow. All of our seedling products follow industry 1020 tray standard size (actual footprint: 11" x 21"). We offer supplies that are economical enough to be disposable, but are heavy-duty enough to be reusable over multiple seasons, including: germination trays with and without drainage holes; microgreens trays; mesh trays; cell flats; and clear plastic domes. Available in small and case quantities. To compare products, including compatibility across products, see our Trays, Domes & Flats Comparison Chart (at right).

Trays, Domes & Flats | Comparison Chart (PDF)

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Jumbo Plug Inserts – 100 Count Cell Flats

Jumbo Plug Inserts – 100 Count

Large cells can be separated into six-packs.

Large cells can be separated into six-packs.

Pro-Tray 72 Cell Flats – 100 Count Cell Flats

Pro-Tray 72 Cell Flats – 100 Count

For home and market gardeners. Round cells.

For home and market gardeners. Round cells.

7" Clear Propagation Domes – 25 Count Humidity Domes

7" Clear Propagation Domes – 25 Count

Create the perfect healing chamber for grafted tomatoes.

Create the perfect healing chamber for grafted tomatoes.

72 Cell Plug Flats – 100 Count Cell Flats

72 Cell Plug Flats – 100 Count

Designed for fresh market growers. Square cells.

Designed for fresh market growers. Square cells.

Mini Square Plastic Pots – 540 Count Plastic Pots

Mini Square Plastic Pots – 540 Count

For big stocky transplants.

For big stocky transplants.

Pro-Tray 24 Cell Flats – 100 Count Cell Flats

Pro-Tray 24 Cell Flats – 100 Count

For home and market gardeners. Round cells.

For home and market gardeners. Round cells.

Shallow Germination Trays – 100 Count Support Trays

Shallow Germination Trays – 100 Count

Slots for uniform drainage.

Slots for uniform drainage.

3" Humidity Dome – 6 Count Grow Lights and Carts

3" Humidity Dome – 6 Count

Perma-Nest Tray Accessory

Standard domes for Perma-Nest Trays.

Standard domes for Perma-Nest Trays.

3" Humidity Dome – 24 Count Grow Lights and Carts

3" Humidity Dome – 24 Count

Perma-Nest Tray Accessory

Rests on top of Perma-Nest trays.

Rests on top of Perma-Nest trays.

NanoDome – 5 Count Grow Lights and Carts

NanoDome – 5 Count

LED or T5HO Strip Light Accessory

Humidity dome with groove for resting a grow light.

Humidity dome with groove for resting a grow light.

Seedling Trays – 100 Count Support Trays

Seedling Trays – 100 Count

The standard 1020 greenhouse flat with drainage slots.

The standard 1020 greenhouse flat with drainage slots.

Hard Plastic Perma-Nest Trays – 24 Count Trays, Domes, and Flats

Hard Plastic Perma-Nest Trays – 24 Count

Durable trays for our Seedling Light Carts.

Durable trays for our Seedling Light Carts.

NanoDome – Single Grow Lights and Carts

NanoDome – Single

LED or T5HO Strip Light Accessory

Humidity dome with groove for resting a grow light.

Humidity dome with groove for resting a grow light.

5 1/2" Vented Humidity Dome – 4 Count Grow Lights and Carts

5 1/2" Vented Humidity Dome – 4 Count

Perma-Nest Tray Accessory

Tall domes for Perma-Nest Trays.

Tall domes for Perma-Nest Trays.

Soil Block Propagation Trays – 50 Count Trays, Domes, and Flats

Soil Block Propagation Trays – 50 Count

These wide-mesh bottom trays are ideal for soil block propagation.

These wide-mesh bottom trays are ideal for soil block propagation.

Soil Block Propagation Trays – 5 Count Trays, Domes, and Flats

Soil Block Propagation Trays – 5 Count

These wide-mesh bottom trays are ideal for soil block propagation.

These wide-mesh bottom trays are ideal for soil block propagation.

200 Cell Plug Flats – 50 Count Cell Flats

200 Cell Plug Flats – 50 Count

Designed for fresh market growers. Square cells.

Designed for fresh market growers. Square cells.

5 1/2" Vented Humidity Dome – 1 Count Grow Lights and Carts

5 1/2" Vented Humidity Dome – 1 Count

Perma-Nest Tray Accessory

Tall domes for Perma-Nest Trays.

Tall domes for Perma-Nest Trays.

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