Three tips for growing annuals…
1. Planting and spacing: Plant transplants closely so they fill in quickly. Usually, the tag will say to plant 8 to 12 inches apart, so pick 8 inches for a great show of flowers more quickly. I actually take a ruler into the garden, or measure off the spacing with my trowel. If the plants are a bit pot-bound (roots circling around), cut an X into the bottom with a knife or use your fingers to tease them apart so they make better contact with soil.
2. Watering: Annuals need water to thrive. Water them deeply two to three times a week after planting. The moist soil will encourage good growth. For the best show of color all summer, don’t let up on the watering.
3. Feed your plants: Once a week, feed your plants with a balanced all-purpose 20-20-20 fertilizer that you mix with water. You’ll find traditional or organic fertilizers – either will do the job. One good organic is fish emulsion, which I like to mix together with a kelp-based fertilizer. Your annuals will grow even better if you mix some compost or manure into your soil before you plant.