- 1). Combine 3 parts potting soil, 1 part coarse sand and 1 part fine sand to create a growing mix suited to the needs of broadleaf sage.
- 2). Fill a 2-inch-deep seedling tray with the soil mixture to within 1/2 inch of the top. Even out the surface but do not firm the soil.
- 3). Sprinkle the broadleaf sage seeds onto the soil so that approximately three seeds fall per square-inch. Cover the seeds with a thin layer of fine sand to hold them in place while still allowing light to reach them.
- 4). Mist the soil until the top half-inch feels moderately moist but not soggy. Maintain moisture in the top half-inch of soil while the broadleaf sage seeds germinate, but allow the surface to dry out slightly between waterings to keep the soil from becoming waterlogged.
- 5). Set the seedling tray near a source of very bright light, either near a large window or under a fluorescent lamp. Choose a spot with direct light for six to eight hours each day.
- 6). Apply bottom heat to the broadleaf sage seeds using a propagation mat set to 78 degrees F. Lower the temperature to 60 degrees F at night to mimic the natural warming and cooling cycle found outdoors.
- 7). Watch for germination in two weeks. Thin the seedlings to one per square inch once they produce a pair of mature leaves, which are oblong, fleshy and slightly hairy.
- 8). Transplant the broadleaf sage seedlings into individual 3-inch starter pots two weeks after thinning them. Fill the starter pots with the soil mixture described in Step 1.
- 9). Keep the individually potted broadleaf sage plants in a warm, sunny spot until they put on significant growth. Plant them in a permanent pot or outdoors in a sunny, sandy bed once all danger of frost has passed.
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