If you’re searching for a delicate yet vibrant flower to brighten your garden beds, containers, or hanging baskets, Lobelia Palace Sky Blue is a fantastic choice. Known for its masses of soft, sky-blue blooms and mounding habit, this variety is perfect for edging, borders, or spilling gracefully over planters. Lobelia Palace Sky Blue thrives in cooler temperatures and can bring a lush, continuous splash of color from spring into early fall.
In this guide, you’ll learn how to start Lobelia seeds successfully, how to care for the seedlings, and how to enjoy the fullest, longest-lasting display in your garden.
Step 1: Starting Lobelia Seeds
Lobelia seeds are tiny and, in the case of Palace Sky Blue, often sold as multi-pelleted seeds to make sowing easier. Start seeds indoors 8–10 weeks before your last expected frost. Use a fine seed-starting mix and sow the seeds on the surface—do not cover them with soil, as they need light to germinate.
Mist the surface gently with water and cover your seed tray with a clear plastic lid or wrap to retain moisture. Keep the temperature between 65–70°F. Germination usually takes 14–20 days.
Step 2: Transplanting Seedlings
Once seedlings develop their first true leaves, gently transplant them into individual pots or cell packs. Be careful—lobelia seedlings are delicate. Keep them under bright light or in a sunny window to prevent them from becoming leggy.
When the outdoor temperature is consistently above 50°F, begin hardening them off by placing them outside for a few hours a day, gradually increasing the time over a week.
Step 3: Planting Outdoors
Choose a location with partial to full sun. In hotter climates, afternoon shade will help maintain the flowers’ vibrant color and prolong blooming. Lobelia prefers rich, well-draining soil with consistent moisture.
Space plants about 6 inches apart to allow them to form dense, colorful mounds. Water regularly—lobelia does not like to dry out.
Step 4: Care for Continuous Blooms
For the best flower display, fertilize lightly every 2–3 weeks with a balanced, water-soluble fertilizer. Deadheading isn’t necessary for Lobelia Palace Sky Blue, but trimming back lightly during mid-summer can encourage fresh growth and renewed blooming.
Companion Planting with Geraniums
Lobelia pairs beautifully with geraniums, providing a cool, airy backdrop to the bold colors of geranium blooms. If you’re growing geraniums from seed, try our proven germination method: place the seeds in a damp paper towel inside the fridge for 24 hours before planting to soften the seed coat. This boosts germination rates and leads to stronger plants.
Read more in our guide: Starting Geranium Seeds – Tips for Strong Germination and Healthy Plants.
Where to Buy Lobelia Palace Sky Blue Seeds
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Bulk Packs: Lobelia Palace Sky Blue – Trailing Petunia Bulk Seeds
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Smaller Packs: Trailing Petunia – All Seed Collections