Seed Starting Supplies | Johnny's Selected Seeds

Skip to main content Skip to footer content

New for 2026. SHOP NOW →

0

View Cart

Johnny's offers all the seed-starting and propagation supplies you need to grow your own professional-quality seedlings with efficiency. Growing your own transplants from seed provides greater control over the growing season, from start to finish, by allowing you to choose your favorite varieties, select specific planting and transplanting dates, and produce the quantities of plants you need.

Satisfaction Guarantee

246 Products

Sort By:

New

Polypro Endurance Shallow Speed Tray (No Holes), Black – 4 Count Support Trays

Polypro Endurance Shallow Speed Tray (No Holes), Black – 4 Count

Reinforced trays with "bumpers" for soil block alignment.

New

Johnny's Commercial LED Light Cart – 8 Trays LED

Johnny's Commercial LED Light Cart – 8 Trays

Designed for commercial grower applications.

New

Polypro Endurance Shallow Speed Tray (No Holes), Black – 24 Count Support Trays

Polypro Endurance Shallow Speed Tray (No Holes), Black – 24 Count

Reinforced trays with "bumpers" for soil block alignment.

Hand Seed Sower Seed Starting Supplies

Hand Seed Sower

Saves you time and seeds.

Lightweight Deep Trays – 5 Count Support Trays

Lightweight Deep Trays – 5 Count

The standard 1020 greenhouse flat without drainage slots.

4-Cell Handheld Soil Blocker Soil Blocking

4-Cell Handheld Soil Blocker

Create soil blocks for seeding and transplanting.

72 Cell Plug Flats – 5 Count Cell Flats

72 Cell Plug Flats – 5 Count

Designed for fresh market growers. Square cells.

Top-Grafting Clips with Channel – 2.8 mm Grafting Supplies

Top-Grafting Clips with Channel – 2.8 mm

Protect and support newly grafted plant stems to aid in healing.

Johnny's 512 Mix – 20 Qt. Growing Media

Johnny's 512 Mix – 20 Qt.

5-Cell Handheld Soil Blocker Soil Blocking

5-Cell Handheld Soil Blocker

Create soil blocks for seeding and transplanting.

Johnny's Germination Mix – 20 Qt. Growing Media

Johnny's Germination Mix – 20 Qt.

Consistently a top performer in our annual germination trials.

20-Cell Handheld Soil Blocker Soil Blocking

20-Cell Handheld Soil Blocker

Create soil blocks for seeding and transplanting.

Johnny's Seedling Heat Mat – 9" x 19.5" Seedling Heat Mats

Johnny's Seedling Heat Mat – 9" x 19.5"

Improved germination for heat-loving crops.

2" Clear Acrylic Domes – 5 Count Humidity Domes

2" Clear Acrylic Domes – 5 Count

Holds moisture and warmth for germination.

SureRoots® 50-Cell Deep Plug Flats – 5 Count Cell Flats

SureRoots® 50-Cell Deep Plug Flats – 5 Count

Promotes deeper root development.

Johnny's 12-Cell Handheld Soil Blocker Soil Blocking

Johnny's 12-Cell Handheld Soil Blocker

Reduce your workload and improve your efficiency.

Microgreens Reservoir Tray Microgreens Supplies

Microgreens Reservoir Tray

Microgreens Accessory

Durable and reusable.

Maxi Square Plastic Pots – 18 Count Plastic Pots

Maxi Square Plastic Pots – 18 Count

For larger seedlings like peppers and tomatoes.

Fort Vee All-Purpose Potting Mix – 20 Qt Growing Media

Fort Vee All-Purpose Potting Mix – 20 Qt

A popular mix for the professional grower.

Johnny's 10-Cell Handheld Soil Blocker Soil Blocking

Johnny's 10-Cell Handheld Soil Blocker

Reduce your workload and improve your efficiency.

Johnny's Modular LED Grow Light Cart LED

Johnny's Modular LED Grow Light Cart

Convenient, customizable LED light system.

Top-Grafting Clips with Channel – 1.5 mm Grafting Supplies

Top-Grafting Clips with Channel – 1.5 mm

Protect and support newly grafted plant stems to aid in healing.

50 Cell Plug Flats – 5 Count Cell Flats

50 Cell Plug Flats – 5 Count

Designed for fresh market growers. Square cells.

Top-Grafting Clips with Channel – 2.2 mm Grafting Supplies

Top-Grafting Clips with Channel – 2.2 mm

Protect and support newly grafted plant stems to aid in healing.

Polypro Endurance Deep Tray (No Holes), Black – 4 Count Support Trays

Polypro Endurance Deep Tray (No Holes), Black – 4 Count

Johnny's thickest wall trays.

Johnny's Commercial LED Light Cart – 16 Trays LED

Johnny's Commercial LED Light Cart – 16 Trays

Designed for commercial grower applications.

Fort Vee All-Purpose Potting Mix – 45 Qt Growing Media

Fort Vee All-Purpose Potting Mix – 45 Qt

A popular mix for the professional grower.

Polypro Endurance Deep Tray (No Holes), Blue – 4 Count Support Trays

Polypro Endurance Deep Tray (No Holes), Blue – 4 Count

Johnny's thickest wall trays.

3 1/8" Round Fertil Pots – 90 Count Biodegradable Pots

3 1/8" Round Fertil Pots – 90 Count

100% organic, OMRI Listed® biodegradable pots.

Lightweight Shallow Trays – 5 Count Support Trays

Lightweight Shallow Trays – 5 Count

A great multi-use tray for any operation.

Polypro 5x5 Insert Pots – Black, 8 Count Plastic Pots

Polypro 5x5 Insert Pots – Black, 8 Count

Resilient and reusable.

7" Clear Propagation Domes – 5 Count Humidity Domes

7" Clear Propagation Domes – 5 Count

Create the perfect healing chamber for grafted tomatoes.

Polypro 5x5 Insert Pots – Blue, 8 Count Plastic Pots

Polypro 5x5 Insert Pots – Blue, 8 Count

Resilient and reusable.

Johnny's Seedling Heat Mat – 20.75" x 48" Seedling Heat Mats

Johnny's Seedling Heat Mat – 20.75" x 48"

Improved germination for heat-loving crops.

Polypro Endurance Deep Tray (No Holes), Red – 4 Count Support Trays

Polypro Endurance Deep Tray (No Holes), Red – 4 Count

Johnny's thickest wall trays.

20-Row Seed Flats – 5 Count Cell Flats

20-Row Seed Flats – 5 Count

Ideal for seed starting.

36 Cell Fertil Pots Strip – 10 Count Seed Starting Supplies

36 Cell Fertil Pots Strip – 10 Count

100% organic, OMRI Listed® biodegradable pots.

Johnny's 512 Mix – 60 Qt. Growing Media

Johnny's 512 Mix – 60 Qt.

Basic Microgreens Seed Starter Kit Microgreens Supplies

Basic Microgreens Seed Starter Kit

Grow microgreens indoors year-round.

Johnny's Commercial Heat Mat – Master Seedling Heat Mats

Johnny's Commercial Heat Mat – Master

Improved germination for heat-loving crops.

Growlight Garden Seed Starter Kits

Growlight Garden

Complete kit for growing a garden in your home.

Jumbo Plug Inserts – 5 Count Cell Flats

Jumbo Plug Inserts – 5 Count

Large cell flats can be separated into six-packs.

4" Round Fertil Pots – 50 Count Biodegradable Pots

4" Round Fertil Pots – 50 Count

100% organic, OMRI Listed® biodegradable pots.

Heavyweight Mesh Tray – 5 Count Support Trays

Heavyweight Mesh Tray – 5 Count

Heavy duty support for other seedling containers.

128 Cell Plug Flats – 5 Count Cell Flats

128 Cell Plug Flats – 5 Count

Designed for fresh market growers. Square cells.

Bioset Germinator Kit Seed Starting Supplies

Bioset Germinator Kit

Experience a wide range of flavors.

Fort Light Potting Mix – 45 Qt Growing Media

Fort Light Potting Mix – 45 Qt

A nutrient-rich organic mix for starting vegetables and annuals from seed.

Seedling Grower Starter Kit Seed Starter Kits

Seedling Grower Starter Kit

Grow your own seedlings at home.

Terrafibre Hemp Grow Mats, 10" x 20" – 10 Count Microgreens Supplies

Terrafibre Hemp Grow Mats, 10" x 20" – 10 Count

Microgreens Accessory

Microgreens media made from a renewable resource.

Jumbo Square Plastic Pots – 8 Count Plastic Pots

Jumbo Square Plastic Pots – 8 Count

For very large seedlings such as squash and pumpkins.

Miter-Cut Grafting Knife Seed Starting Supplies

Miter-Cut Grafting Knife

Improves speed, accuracy, and repeatability for top grafting.

Polypro Shallow Tray (No Holes), Black – 4 Count Support Trays

Polypro Shallow Tray (No Holes), Black – 4 Count

Solid trays without holes (for bottom watering and support).

Widger Seed Starting Supplies

Widger

A great multipurpose tool for seed starting.

Fort Light Potting Mix – 20 Qt Growing Media

Fort Light Potting Mix – 20 Qt

A nutrient-rich organic mix for starting vegetables and annuals from seed.

Mini Square Plastic Pots – 18 Count Plastic Pots

Mini Square Plastic Pots – 18 Count

For big, stocky transplants.

Polypro 2.5" Insert Pots – Black, 32 Count Plastic Pots

Polypro 2.5" Insert Pots – Black, 32 Count

Resilient and reusable.

Polypro Mesh Deep Tray, Black – 4 Count Support Trays

Polypro Mesh Deep Tray, Black – 4 Count

Durable trays for support and drainage.

6-Cell Tray Inserts – 24 Count Cell Flats

6-Cell Tray Inserts – 24 Count

Reusable inserts for 1020 trays.

6-Cell Tray Inserts – 6 Count Cell Flats

6-Cell Tray Inserts – 6 Count

Reusable inserts for 1020 trays.

Polypro 2.5" Insert Pots – Black, 8 Count Plastic Pots

Polypro 2.5" Insert Pots – Black, 8 Count

Resilient and reusable.

2 1/3" Round Fertil Pots – 160 Count Biodegradable Pots

2 1/3" Round Fertil Pots – 160 Count

100% organic, OMRI Listed® biodegradable pots.

Pro-Tray 38 Cell Flats – 5 Count Cell Flats

Pro-Tray 38 Cell Flats – 5 Count

For home and market gardeners. Round cells.

Polypro 5x5 Insert Pots – Black, 24 Count Plastic Pots

Polypro 5x5 Insert Pots – Black, 24 Count

Resilient and reusable.

Polypro 2.5" Insert Pots – Blue, 32 Count Plastic Pots

Polypro 2.5" Insert Pots – Blue, 32 Count

Resilient and reusable.

Smart Pot® Natural – 15 Gal. Grow Bags

Smart Pot® Natural – 15 Gal.

Fabric planters promote healthy roots.

Polypro Endurance Deep Tray (No Holes), Blue – 24 Count Support Trays

Polypro Endurance Deep Tray (No Holes), Blue – 24 Count

Johnny's thickest wall trays.

Johnny's Commercial Heat Mat – Add-On Seedling Heat Mats

Johnny's Commercial Heat Mat – Add-On

Polypro 5x5 Insert Pots – Blue, 24 Count Plastic Pots

Polypro 5x5 Insert Pots – Blue, 24 Count

Resilient and reusable.

Pro-Tray 24 Cell Flats – 5 Count Cell Flats

Pro-Tray 24 Cell Flats – 5 Count

For home and market gardeners. Round cells.

Bioset Germinator Seed Starting Supplies

Bioset Germinator

Grow fresh sprouts for salads right in your kitchen.

Mini Wand Seeder with Air Valve and Hose Seed Starting Supplies

Mini Wand Seeder with Air Valve and Hose

One of the best seeders for handling extremely small seeds.

Medium Weight Mesh Tray – 5 Count Support Trays

Medium Weight Mesh Tray – 5 Count

Reinforced support for other seedling containers.