Dwarf forms of sunflowers (Helianthus annuus) may be smaller than their gigantic relatives that have flowers over a foot wide, but with vibrant colors of yellow, red, orange and white, the dwarf flowers are just as cheery, plus they grow easily in containers. Some varieties have extra features, such as Helianthus annuus 'Elf' with 4-inch flowers that attract butterflies and Helianthus annuus 'Little Becka_'_ with 6-inch bicolor flowers in red and yellow. Dwarf sunflowers are annuals that typically bloom from summer through early fall in U.S. Department of Agriculture plant hardiness zones 2 through 11.
Light and Water
Like their larger relatives, dwarf sunflowers thrive with full sun, needing at least six hours of direct sunlight a day. While sunflowers can be drought-tolerant, you need to water container plants more often than plants grown in the ground. Water deeply once a week, but if the leaves on your plant appear droopy, it's a sign that you may be overwatering. Sunflowers need good drainage, so if the problem persists even after you cut back on watering, consider repotting the plant with a faster-draining soil mix.
Dwarf sunflowers don't need a lot of fertilizer if the soil in their container is rich in nutrients. But you do need to feed them at least once during the growing season with a balanced, all-purpose fertilizer. Monthly feedings will help ensure that the plants grow to their maximum levels. Follow package directions so you don't burn the plants with too much fertilizer.
Dwarf sunflowers do not benefit from pruning. But your containers will look best if you pinch off spent leaves that have turned brown or yellow and if you remove any of the plants that are dying.
Pests and Disease
A number of insects and diseases can damage dwarf sunflowers. For spots of fungus on leaves or powdery mildew, treat the plants with a commercial, natural product designed to minimize damage to the environment, and use the product exactly as directed on the packages. Control any caterpillars or beetles feeding on the sunflower leaves by handpicking them off or spraying the plants with a commercial product as directed.
Dwarf sunflowers work well as cutting flowers for indoors because their bright colors and compact flowers don't droop over, as happens with larger sunflowers. Cut flowers off your plants during the morning when the plants are freshest, and immediately place the flowers in a container of water. Once inside, re-cut the stems as needed, preferably under running water, and place them in a vase right away. Change the water every few days, and re-cut the stems to prolong the life of the flowers.
The stems and leaves of sunflowers have a prickly surface and may cause skin irritation. Wear gloves and long sleeves to help ensure your safety.