Answer: As with most smaller perennials, the best time to plant these would be in early spring when they are naturally beginning thier most active growth phase. However,if they are container grown, they can usually be planted successfully at any time during the growing season. Several inches of organic mulch over the root area and under the foliage (but not touching the stem)can be helpful with the phlox. The ice plant on the other hand seems to do better with a gravel mulch. Take care to keep them well watered (moist but not sopping wet, check both the potting mix and the surrounding soil with your finger) while they are rooting and up until the ground freezes this fall, and also check them the first fall, winter and spring to correct any frost heaving. (The freeze thaw actions can cause them to pop up out of the soil until they are well rooted.) Since it is now midsummer, you may also find that the selection of plants is wider in the spring as well.
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