Nitrate Nitrogen Fertilizers for Cold-Season Flowers

Pansies, ornamental kale, and chard need nitrogen that roots can absorb in cold soil (<40 °F). Nitrate nitrogen (NO₃⁻) is immediately available; ammonium and urea forms require microbial conversion, which stalls in cold temperatures.

Look for products labeled “nitrate nitrogen” or “for cool-season flowers.” Pansy Booster™ is widely available; some coated, slow-release fertilizers also contain nitrate forms. Check the guaranteed analysis on the bag.