If pelleted seed is used, keep the seed consistently moist until seedling emergence to ensure the pellet dissolves. Once all seedlings have emerged, air temperature can be lowered to 60F. Seedlings can be transplanted into packs or pots five to six weeks after sowing. Plants can be grown at a wide temperature range, but pay particular attention to watering and fertilization. Recommended fertilizer rate is 100-150 parts per million constant feed. Lobelia can be treated with B-Nine, two applications at 2,500 ppm, to control height.
Lobelia requires long-day conditions to initiate flower buds.
Reduce crop time by providing supplemental lighting. Also, provide adequate light levels to avoid stretching. Alternaria leaf spot can be prevented with foliar fungicide applications. Crop time varies depending on temperature, light levels, day length and plug tray, pack or pot size. The early-flowering Riviera and Regatta series can be ready for spring sales.