Pelargonium x hortotum. Black Velvet Rose Geranium seeds should be started indoors in early spring. Once the weather warms up in late spring to early summer, and night time temperatures are steadily above 10°C (50°F), the curious little seedlings can be transplanted outdoors. Expect dark, nearly jet-black foliage with each leaf marked by a light green margin. Above the unique foliage rise clusters of florets in bright rose pink with white centres. This hybrid geranium has robust growth and a nicely mounded form that is heat tolerant, and well suited for container growing, so it's a superb choice for patio gardens.
Annual.
Black Velvet Rose Geranium seeds should be started indoors in early spring. Once the weather warms up in late spring to early summer, and night time temperatures are steadily above 10°C (50°F), the curious little seedlings can be transplanted outdoors. Continue reading below for more tips on how to grow geraniums from seed.
Latin
Pelargonium x hortotum
Family: Geraniaceae
Difficulty
Easy
Season
Exposure: Full sun
Timing
Start seeds indoors about 6-8 weeks before transplanting out.
Starting
Sow seeds 5mm (1/4”) deep, using sterile seed starting mix. Use bottom heat until germination, and continue unless the room is particularly warm. Pot seedlings on into 4” peat or coir pots about 3 weeks after sprouting.
Growing
Harden off seedlings gradually over 1 week, once night time temperatures are consistently above 10°C (50°F). Geraniums are fairly hungry feeders that benefit from rich garden soil and regular feeding with liquid fertilizer or compost tea. Grow in full sun to achieve the best foliar colour.
