How to Plant Seed Bombs

A little preparation gives native seeds a better start. Follow this guide alongside the instructions for your particular seed mix.

Four steps to get growing

1. Choose a suitable spot. Match your mix to your region, sunlight, and soil moisture. Plant on your own property or where you have permission.

2. Prepare the soil. Remove competing grass and weeds and expose the soil surface. Avoid scattering seed bombs over dense lawn, thick mulch, or leaf litter.

3. Place on the surface. Set seed bombs on prepared soil and press gently for contact. Do not bury deeply. Follow your pack’s spacing guidance rather than piling several together.

4. Water and care. Water gently if conditions are dry. Keep the planting area moist during germination and early establishment, without waterlogging it. Adjust watering for rainfall and your mix’s needs, and carefully remove competing weeds.

Frequently asked questions

What is a seed bomb?

A small ball containing seeds and a planting medium. Radical Roots seed bombs combine seeds with clay, worm castings, and biochar. As the ball weathers and softens, seeds can germinate when conditions suit them. Seed bombs still need a suitable site and care.

When should I plant?

Late fall is a useful option for many native perennial mixes because winter provides cold, moist conditions that some seeds need. Spring planting is possible, but preparation and timing depend on the species. Check your mix’s instructions or ask us for guidance.

What is cold stratification?

Some seeds need a period of cold, moist conditions to relieve dormancy before germination. Requirements vary by species; some need no cold treatment. Keeping a dry seed bomb cold is not the same process.

When will I see seedlings and flowers?

Mixed plantings develop at different rates. Some seeds germinate when conditions become suitable; others need winter conditions or take longer. Many perennial wildflowers establish roots and leaves in their first season and flower more fully in later years. First-year flowers are possible for some species, but are not guaranteed.

Can I throw them onto my lawn?

A prepared patch gives them a better chance. Dense grass competes for light, water, and space. Create openings with exposed soil before planting and keep competing vegetation in check.

Can I plant in a container?

Yes, with a suitable mix and a sufficiently large pot with drainage. Check mature plant size and overwintering needs. Containers dry out faster than garden beds and may need more frequent watering.

How many do I need?

Follow the quantity and spacing guidance for your product. Coverage estimates describe a planting area, not guaranteed complete flower coverage. For larger sites, ask us about a suitable mix and quantity.

Will every seed grow?

Not every seed will germinate or survive. Moisture, temperature, competition, dormancy, and site conditions all affect establishment. Results vary between sites and seasons.

Nothing is growing. What should I check?

Review timing, soil contact, moisture, sunlight, and competition. Consider whether your mix needs a cold, moist period and whether enough time has passed. Send us your mix name, location, planting date, and a photo so we can help troubleshoot.

Can I plant anywhere in Canada?

Choose species appropriate to your region and site. Native to Canada does not mean native to every local ecosystem. Do not plant in parks, protected areas, shorelines, or other land without permission and appropriate local guidance.

Will seed bombs remove invasive plants?

No. Seed bombs can be part of a planting project, but site preparation, management of competing vegetation, and follow-up care remain important.

Need help choosing a mix?

Tell us your location, sunlight, soil moisture, and whether you’re planting in a garden or container.

Ask Radical Roots → · Shop seed bombs →

Want to learn together? Explore our workshops and environmental talks.