The faces of the flowers turn to the sun, from east to west, each day, so when you plant sunflowers, be sure to plant them in full sun. Find a place where they will be appealing whether they're facing the morning sun or the late afternoon sun. Remember that they will grow very tall, so don't put them where they will shade other sun loving plants. Sunflower seed for growing is easily found almost anywhere garden seed is sold. If you do, plant them outside after the last frost date and keep well watered until they are established.
Sunflowers grow in almost any soil, but the better the soil, the better they'll grow.
Choose soil that's rich and well drained, but if you don't have that kind of soil, add peat moss or other humus and mix thoroughly before planting. To direct seed into your garden, wait until after the last frost date in your area, then work the soil thoroughly and plant seeds one-half to one inch deep, about twelve inches apart. Water well after planting. After the seedlings are up, mulch the area and hand weed for the first few weeks, until they are at least a couple of feet tall. After the roots are well established and the plants are robust, they can hold their own against drought and nearby weeds.