Image 1 of 1 St. Johns Wort (Hypericum perforatum) $16.00 Pre-order: St. Johns Wort plants will be available in May. Add to Garden Added! Pre-order: St. Johns Wort plants will be available in May. Growing Guide LIFE CYCLE Shrub, herbaceous perennial SUN EXPOSURE 6-8 hours of direct sunlight SOIL MOISTURE Dry to moist, well-draining SIZE AVERAGE 3' tall, 2' wide SPACING 18-24" BLOOMS Clusters of yellow, May-August PAIR WITH Butterfly weed, Mountain mint, Wild blue phlox, Rose mallow, Wild bergamot ADVANTAGES Pollinator, Deer-resistant, Family-friendly CARE Easy