How to Collect and Save Coleus Seeds for Next Season

Overview

Coleus plants are beloved for their carefree versatility in containers, beds, and landscapes. Though their seeds are tiny, collecting and saving them is straightforward—even for beginners—ensuring your favorite varieties return year after year.

Step 1: Monitor Flower Spikes

In fall, check plants daily as flowers fade. Allow stems to turn completely brown.

Step 2: Harvest Stalks

Use clean, sharp shears to cut bloom stalks (pinching risks uprooting the plant). Wrap loosely in a paper towel for transport.

Step 3: Dry the Stalks

Place stalks in a paper bag in a warm, dry, well-ventilated spot out of direct sun. Air-dry for 2 weeks.

Step 4: Shake Daily

Shake the bag daily to prevent pods from clumping and to promote moisture evaporation. Mature seeds will naturally fall into the bag.

Step 5: Strip Remaining Pods

After 2 weeks, run each spike between thumb and forefinger to release remaining pods into the bag.

Step 6: Separate Seeds from Debris

Fold a piece of white paper, crease sharply, and dump bag contents onto it. Crush pods with fingers—ripe seeds pop out easily.

Step 7: Final Cleaning

Fold paper to enclose seeds. Pour into a pepper shaker (lid removed), cap, and shake. Tiny seeds fall onto paper; chaff stays in shaker for disposal.

Step 8: Store Properly

Place clean seeds in a paper envelope in a cool, dry, dark location until spring planting.