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The
three most challenging things perennial gardeners face here in North
Texas are June, July, and August. Many plants normally thought of
as “heat tolerant” melt in our extended periods of 100+ degree weather.
High humidity and high night temperatures knock out weaker plants,
those misplaced, and/or new and non-well established plants. Lily
of the Valley, Primroses, and Forget-me-nots do not survive our
Texas summers.
For summer success, use well adapted
plants such as natives and drought-tolerant plants. Plant well before
the Texas heat arrives. Container-grown plants can be set out successfully
in the heat, but they will require careful watering the first summer.
Locate the plant in the right spot: Consider light intensity, drainage,
and soil moisture levels.
Plants that tolerate full sun to
moderate shade and moderately moist to quite dry soil are: dwarf
Ruellia (three colors available), purple
cone flower, flame
acanthus, Turk’s
cap, the tall sedums, ox-eyed daisy and autumn
sage.
For very hot, reflected heat areas
in full sun or afternoon sun (with very good drainage) try four-nerve
daisy, black-foot daisy,
calylophus, artemisia, red yucca, hardy cactus, trailing sedums,
pavonia, skullcap,
and other natives such as zexmenia. If the planting location is
not raised or on a slope and the soil is black clay, these plants
need to be planted on mounds of soil at least 6 inches above the
surrounding grade.
For full-sun areas where drainage
is good and weekly watering is planned, consider black-eyed
Susans, coreopsis, eupatorium, gaura,
hardy lantana,
verbena, veronica, mounding dianthus, thrift
and garden phlox, most salvias,
yarrow, bee balms, asters,
goldenrod, obedience
plant, and all the widely adapted plants mentioned earlier.
Although these plants generally need as much water as turf grass,
new plants will require more frequent watering to establish their
roots (usually a month or two).
For areas with full sun in the morning
only or bi-weekly watering, the following are good choices: Ruellia,
woodland phlox,
coral bells, daylilies,
lady’s mantle, hollyhocks, balloon
flower, spiderwort, loosestrife, hardy
hibiscus, and wood fern.
Areas with only early morning sun
or dappled shade that stay moist may be planted with the following:
Pink oxalis, dead
nettle, columbine, ferns, hostas, trailing buttercup, moneywort,
aspidistra, violets,
ground ivy, and ajuga. Most shade-loving plants greatly benefit
from added compost in their soil and enhanced drainage.
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