Add Organic Fertilizer Sparingly
Cornflowers don’t need heavy feeding, but a light application of organic fertilizer can boost bloom size and plant vigor—especially in lean soil. Avoid high-nitrogen fertilizers, which will produce lots of foliage but fewer flowers. Look for something balanced or slightly higher in phosphorus.
I like to side-dress with compost once the seedlings are a few inches tall, or use a diluted liquid fish emulsion every couple of weeks until they start to bloom. Healthy, well-fed plants are more resilient to wind, pests, and disease. Plus, you’ll notice a difference in the depth of color and size of each flower when the nutrients are just right!