lobelia

Lobelia 'Grape Knee-Hi' requires frequent watering, about twice a week. During the daytime in summer when the temperatures are warmer, water the plant until the soil is moist but not soggy; a good indication that the plant is getting enough water is when water runs out of the pot's bottom drainage hole. Fertilize with a water soluble fertilizer according to label instructions and stop fertilizing in the fall. In winter, reduce watering significantly but make sure the soil never gets bone-dry. Water only when the top inch of soil is dry.

Lobelia 'Grape Knee-Hi' requires at least 6 hours of direct sunlight every dayto maintain its peak health. Full sun in the morning is essential for blooming, so if possible, it should be placed in a sunny spot that receives blanketed morning light. Make sure that the plant's foliage is not directly exposed to the sun's midday heat. Additionally, Lobelia 'Grape Knee-Hi' should be taken out of the sun in the evening, as it does not tolerate extended periods with direct afternoon sunlight.

Lobelia 'Grape Knee-Hi' should be pruned in late winter or early spring. Prune back the plant to about 3-4 inches above the soil line to display a tighter, more attractive form and to keep the plant in bounds. Remove any dead stems or thin out any overcrowding. Be cautious not to take too much off the plant, as it may not recover. If blooming has finished by midsummer, it is safe to cut the stem down to 4 inches above the soil.