Treasuresbylee - Tempo Butterfly MIX Impatiens - 25 Heirloom Flower Seeds Impatiens 25 Freshly Harvested Seeds Beautiful Packaging, Instructions on backside. The closer impatiens plants are, the taller they will grow, so space accordingly (impatiens plants can grown anywhere between 6 and 30 inches tall). For flower beds, plant 8 to 12 inches apart so the plants will stay low to the ground. You can mix in compost or a slow-release fertilizer before transplanting to help the plants. The most important thing to remember about impatiens plants is to water them regularly. Keep them moist, but not too wet. If the plants dry out, they will lose their leaves. If you over-water the plants, this could encourage fungal diseases.