Planting Instructions for Phlox paniculata (tall garden phlox):
|Bloom Time: Late summer
||Light: Full sun to part shade
|Soil: Average to rich, moist but well-drained
||Moisture: Average to slightly moist, dry in winter
|Planting Depth: Uppermost sprouts 1" below soil, mulch 1 to 2"
||Spacing: 18 to 24"
Upon arrival: Unpack box and check that you have everything on your packing list. Phlox paniculata likes to be somewhat dry when dormant, so if condensation has formed on the inside of the bag, open and air it out then close the bag again. Plant everything within a few days.
Soil/Location: Plant your Phlox paniculata towards the back of the garden in full sun to part shade in average to rich, moist but well-draining soil. Avoid areas that may collect water or stay wet for too long as they are not tolerant of being wet in the winter.
Moisture: Phlox paniculata doesn't like to dry out too much but also doesn't like to be in standing water. Keep them evenly moist and water deeply if they wilt, allowing the soil to dry slightly between watering. If plants become too dry and stressed out they are more prone to powdery mildew.
Spacing: 18 to 24" apart
Depth: To keep the roots cool and moist it is best to plant them a little deeply and keep them mulched. If the crown and roots ever get exposed they will struggle. Plant your tall garden phlox with the uppermost sprouts about 1" below soil level. Some sprouts will often be deeper which is just fine as they will reach the surface and root out along the way. Cover them about an inch of mulch after planting.
General Instructions: Amend your garden with compost or peat humus to enrich or loosen the soil. Phlox paniculata grows fine in just about any good, well-draining soil, but by giving them some good compost they will have more vigor and be less prone to mildew. Mix a couple teaspoons of garden food or bone meal into the planting hole and plant at the depth listed. After planting you can water in once and then they shouldn't need to be watered again until after they are sprouted and actively growing. Once growing water deeply two to three times a week and allow the soil surface to dry out between watering.
Landscape Uses: Garden phlox are great for the middle and back of the perennial garden. They will tolerate partial shade so they can be used on the east or west side of homes or buildings where they won't mind being shaded out for part of the day. Combine them with other summer blooming perennials such as obedient plant (Physostegia), Helianthus, asters, Geranium, daylilies, purple coneflower (Echinacea), Rudbeckia, penstemons, Shasta daisies, Monarda, and ornamental grasses.
Self sown seedlings are common but should be easy to transplant or remove. Deadheading can prevent some of them. Powdery mildew can also be a problem with some varieties. Spraying with a preventive fungicide in mid summer before it occurs will help keep them clean looking, although many varieties are mildew resistant.