Lobelia String of Pearls Mixed (erinus) Sow Indoors: January- April. Sow Outdoors: N/A. Spacing: 6" / 15cm. Flowering Height: Trailing. Flowers: June onwards. Lobelia String of Pearls Mixed (erinus): The ‘String of Pearls’ is a wonderful trailing variety of Lobelia that produces a striking display of mauve, white, red and blue flowers. These are ideal for pots, planters, baskets and borders, where they will spread and fill any gaps left by other plants with their magnificent colours. Half hardy annual. A superb trailing Lobelia. Will create a stunning display of white, red, blue and mauve flowers. Half Hardy Annual.Indoor Planting: Sprinkle seeds onto the surface of the soil in trays of moist compost and cover lightly, be careful not to over-water. Store in a warm place at an approx. temperature of 15-20-°c (60-68-°f).Growing On: When the seedlings are strong enough to handle they can be transplanted into bigger pots or trays. Do not overcrowd the plants and keep in a warm, light position. Once all chance of frost has passed the plants can be transplanted direct into your desired location in May. Harden off first.