Split sections of garden phlox every few years to reduce likelihood of disease (3). Place mulch above compost when plant is mature to help retain soil moisture and discourage weed propagation. Cut back frost-killed stems of phlox, leaving about 2 inches above the soil to regrow. Provide a layer of compost every spring to encourage vigorous growth of the plant. Deadheading (removing dead flowers) will be necessary throughout the blooming season, from July to September, to promote the growth of new blooms (2). Garden phlox is self-seeding and requires weekly watering in its first growing season (1). The flowers are arranged in loose, branched, flat-topped, racemose clusters at the top of the stem or on the upper leaves of the plant. ![]() Garden phlox is mostly cultivated for its colorful, fragrant flowers that come in light blue, light purple, lavender, lilac, rose and white varieties. Very saturated soil is not good for the plant due to its susceptibility to root rot. Garden phlox likes to be rooted in lightly dampened soil for best growth. When mature, garden phlox stands 2 to 4 feet tall and spreads 1 to 3 feet wide. This plant is tolerant of most lighting conditions ranging from full sun and light shade. Phlox grows in USDA Plant Hardiness zones 4 to 8 and typically grows wild in forests, forest borders, cliffs and open fields. ![]() Garden Phlox is a flowering perennial that is native to eastern United States and southeastern Canada.
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