Be Your Own Wildflower Nursery: Harvest and Sow Seeds for Free Plants

My garden turned six. For years I kept buying plants to fill gaps—even after no gaps remained. Near a nursery, I'd pop in and grab things, especially during fall sales. I'd sneak them home, nestle them among mature plants, hoping my wife wouldn't notice (she didn't care, but maybe I did). My addiction cost money, but it didn't have to.

Fall is my favorite season—crisp mornings, warm afternoons, blue skies, stunning sunsets, a garden rainbow of fall blooms and leaf colors. Once leaves drop, it's easier to spot gaps and plan additions. Fall is perhaps the best planting time—cooler temps ease stress on you and plants, warm soil lets roots establish for a spring head start. But why buy when you can easily harvest and cultivate your own?

Look at this bounty. Fall reveals the garden's structural bones; seed heads add another interest level. All those seed heads mean hundreds of free plants, plus they feed birds and creatures. But when to gather seeds?

Gather Seeds When They're Ready

My rule of thumb: when seeds start falling off or blowing away, they're ready. (Then you must be quick, especially if windy.) Old Liatris blooms puff up, ready for collection.

I walk the garden a few times a week with any container—glass, plastic, paper bags. Wider mouths catch wind-dispersed seeds better.

Sometimes it's easier to cut off plant tops (like ironweed) and drop the whole mess into a bag. Seed heads are tiny; you'd be out there forever otherwise. Save seed stripping for a cold winter afternoon by the fire—make it a date or romantic game. Spice up seed stripping!

Grass seeds are easy: run your hand up the stem, cupping seeds as you go.

One major benefit: if you don't use pesticides/chemicals, you know the seeds are organic. You know the mother plant—where it grew, what it likes, that it thrives in your soil. Locally sourced seeds are as ecologically friendly as any garden act, and you can't get more local than out the back door.

Coneflower seeds aren't the spiky points; the seed is deep inside, tiny rectangular tan pieces half the size of a pinky nail. I sacrifice my thumb—push across the head, getting poked, spikes pop off, seeds slip out.

Mountain mint and monarda seed heads smell great, but seeds are tiny and loose inside faded tubular blooms. Snip whole clumps, hold in a container, crush with fingers to release seeds.

Plant Before Winter

Now you have seeds. Some fell on beds and will resow; move in spring or let them choose. Or winter sow. Many seeds need cold/wet stratification—weeks/months of frigid, moist conditions. In the Central Plains, we call this winter.

Keep old nursery pots or get from a neighbor. Fill halfway with potting soil or garden soil (clay, sand, whatever), broadcast seeds evenly. Let winter snow bury them. Come spring, dozens of seedlings per container, ready to pot up or place in garden once rooted. Congratulations—you're now your own wildflower nursery!

Or Store Seeds for Later

If you don't use all seeds, save them. Many stay viable if stored correctly:

1. Strip each seed from the chaff (feathery/crunchy bits).
2. Let seeds dry out (days to a week). If picked when falling, they're dry. If after rain, dry several days/weeks—spread on a pan/table.
3. Store in a paper bag (good air circulation; glass/plastic encourage mold). School lunch bags folded twice and stapled work great. Label with plant and year. Store in cool, dark, dry place: dry garage, outbuilding, storage bench, basement. Storing outside cold-stratifies seeds—some need moisture, but those needing only cold will be ready come spring/summer.

The first year I winter-sowed in 24 containers. I was giddy as a kid in a candy store come spring. Enough plants to tackle problem areas, with plenty left to gift or sell. Now I'm addicted to collecting plastic pots and cluttering my garden each October/November—but no need to hide it, because the plants are free and I know they'll thrive in my garden.