Irises are hands-down some of the easiest plants you can add to your garden. When they’re happy, they reward you with those stunning, architectural blooms that look like something out of a painting. However, when it comes to feeding them, “less is more” is the golden rule. You definitely don’t want to overdo it!
Fertilizing Your Irises
The Iris (or Sword Lily, as some folks call them) is a light feeder. Their delicate roots are actually pretty sensitive to salt buildup, and over-fertilizing can lead to root rot before you know it. On a similar note, heavy clay soil can cause the same problem. If your dirt is a bit too thick, just mix in some sand to improve drainage and keep those roots dry. So, what’s the “perfect meal” for an Iris? Look for a fertilizer with this ratio:
- One part Nitrogen
- Two parts Phosphorus
- Two parts Potassium
Location is Everything
Before you start digging, take a minute to find the perfect home for your Iris. A sunny spot is the absolute best foundation for a healthy, blooming plant. In fact, if they get enough sunshine, Irises can often bloom beautifully even in poor soil without any extra fertilizer at all! Just keep an eye on which specific variety you have, as some types prefer a bit more moisture than others.
No Blooms? Don’t Reach for the Fertilizer Just Yet
If your Iris isn’t blooming, a lack of nutrients is rarely the culprit, so don’t try to fix it by dumping on more fertilizer. Usually, the plant has just been in the same spot for too long. While some Irises are happy in one place for years, others eventually need a change of scenery. This is a great time to divide the plant. Pick out the healthiest side shoots and replant them in a fresh spot. Just be sure to use a sharp, clean knife to make your cuts so the plant stays healthy and infection-free.
