If you think you know catmint, get that idea out of your head! This particular catmint’s flowers are consistently larger than others and blossom throughout the spring and summer. Irresistable to butterflies and bees, it can grow up to 36” tall with a mounding habit, and does well in sun, but will benefit from some shade in the afternoons.. Mature Size: 28″-36″ x 24″-30″. Full Sun (6+ Hours), Morning Sun Afternoon Shade.