Phlox paniculata 'Luminary Backlight' (Garden Phlox 'Luminary™ Backlight') lights up beds with pure white, fragrant flower clusters held above dark green foliage. You get an upright, clump-forming perennial that fits easily into borders and mixed plantings, reaching about 28-30 inches tall with a spread around 20-24 inches.
Plant it where it receives full sun to part shade. Full sun helps the heaviest flowering, while a little afternoon shade can be helpful in warmer locations. Provide medium moisture and well-drained, fertile soil; keep the root zone evenly moist, especially during dry spells. A summer mulch can help keep roots cool and reduce moisture swings.
For a longer show, remove spent flower clusters as blooms fade. Good air circulation is important for phlox, so space plants to avoid crowding and thin stems if needed. Water at the base rather than overhead to help reduce foliar issues. Taller stems are usually sturdy, but staking can be useful in exposed sites.
Cut plants back to the ground after frost and clean up debris to reduce carryover problems. Hardy in USDA Zones 4-8, this white-flowering selection pairs well with other moonlight-garden favorites and makes a great cut flower for summer arrangements.