Packet of about 100 dwarf sunspot sunflower seeds for planting.
Planting instructions: Plant sunflower seeds at a depth of 1/2 inch and 6 inches apart in the mixture. The soil temperature should be maintained at 70 to 75 degrees Fahrenheit. Spray the soil with room-temperature water if it begins to dry. The seeds should germinate within two to five days, producing dwarf sunflower seedlings.
For container or pot growing: Regardless of the variety, all sunflowers grown in containers should have drainage holes and be situated in an area that receives full sun. Sunflowers need well-draining soil that retains moisture. A good quality general purpose potting soil will work well. For larger pots, mix the potting medium with some vermiculite to lighten the weight of the pots. Add a layer of drainage material such as gravel, terracotta pot pieces, or polystyrene foam to the bottom of the pot and then add the potting medium, filling the container to about halfway. Plant the sunflower and fill in around the roots with additional soil, then water well.
Be sure to keep an eye on the watering needs of sunflowers grown in containers. They will dry out more rapidly than those grown in the garden. A general rule of thumb is to provide an inch (2.5 cm) of water per week depending upon weather conditions. Water the plants when the top inch of soil feels dry to the touch. Fertilize the flowers with a high-nitrogen liquid plant fertilizer and then when a bloom begins to form, switch to a liquid fertilizer high in phosphorous.