We like the Thumbelinas because they are a shorter and smaller variety. You must wait until it is warm outside before you plant the Zinnia seeds. They do not tolerate even a light frost. Plant the seeds 8 to 10 inches apart. You may have to thin the seedlings later if they are too close.
Zinnias like to have space so the air can flow around their leaves.
They need lots of sun too, so plant in an area with full sun. If you give them what they need they will grow and bloom until the first frost in the fall. Be sure to cut them for small bouquets as they bloom, and this will help the plant to continue blooming. This is also known as a Cornflower. They are easy to grow, but also need lots of sun.