Starting Coleus from Seed: A Complete Guide

Overview

Coleus brings instant color and texture to gardens with its brilliant foliage and diverse leaf forms. These adaptable plants flourish in morning sun, quickly filling containers, hanging baskets, borders, and beds. Starting seeds indoors in early spring yields lush plants from late spring through fall.

Step 1: Choose Your Varieties

Select seeds for desired colors and leaf shapes. Mixed-seed packets offer a vibrant assortment.

Step 2: Match Seeds to Light Conditions

Some coleus develop deepest color in full sun; others excel in shade. The Solar Series thrives in afternoon sun but produces muted colors in shade.

Step 3: Prepare Moistened Seed Starter

In a large container, mix seed-starting medium with water until evenly moist.

Step 4: Sow Seeds on Surface

Fill peat pots or flats to ¼–½ inch from top. Sprinkle seeds on surface and press gently—do not cover, as coleus seeds require light to germinate. Mist if surface feels dry.

Step 5: Provide Light and Moisture

Place in a bright location. Keep soil evenly moist until seedlings emerge in 10–14 days. Shield from harsh afternoon sun until plants reach 2–3 inches tall.