American Dittany

Year-round

American dittany is a low, woody-based mint-family perennial that stays under a foot and a half tall and about as wide, with narrow aromatic leaves and small purple to white flowers late in the season. It wants full sun to light shade, lean rocky or sandy soil with sharp drainage, and very little supplemental water once it settles in.

• Full sun to partial shade works well, meaning a few hours of shade a day is fine
• Give it dry, shallow, rocky or sandy soil with fast drainage and a slightly acidic pH. Heavy wet clay is the one thing to avoid
• Mature size runs about 9 to 18 inches tall and just as wide, so space plants roughly a foot apart
• Once established, rainfall alone carries it through Hot Springs dry spells, no regular watering needed
• Comfortably hardy through Hot Springs winters, in the USDA zone 7b to 8a range for this part of Arkansas

Fall

Fall is American dittany's showiest season, with its purple to white flowers peaking and then, after the first hard freeze, thin curls of frozen moisture known as frost flowers forming at the base of the stems.

• Flowers continue from late summer into September and often into October
• After the season's first hard freeze, commonly in early November around Hot Springs, the foliage shifts from green to a deep reddish purple
• That first hard freeze is also when frost flowers can form, thin curls of ice that push out from splits at the base of the stems, a well-known feature of this species
• No deadheading is required. Seed heads can stay for winter interest or be cut back once the frost flower show is over

Cutting the spent stems back once the frost flowers have finished keeps the front bed tidy for winter, an HOA-friendly fall task.

Winter

Winter is dormant season for American dittany. Top growth dies back to a low woody crown, and the same cold, humid mornings that make frost flowers in fall can bring more of them through winter after any hard freeze.

• Top growth goes fully dormant. Cut the dead stems down to a couple of inches for a clean winter look, or leave them standing for more frost flower shows on cold mornings
• Well-drained, rocky or sandy soil matters most in winter. Wet, cold soil is the main way this plant struggles
• It is comfortably hardy through typical Hot Springs winter lows without mulch or covering, in the USDA zone 7b to 8a range
• New growth will not resume until spring warmth returns, so bare stems through winter are normal, not a problem

A late-winter cutback to a low, even mound gives the bed a clean look before spring growth starts, an HOA-conscious way to close out the dormant season.

Spring

Spring is when American dittany wakes up from its winter crown and pushes new aromatic foliage, usually once nights warm up after the last frost in the Hot Springs area.

• New leafy growth comes up from the woody base as soil warms in April, once the area's typical last frost has passed (commonly late March around Hot Springs)
• If you did not cut back last year's dead stems in late winter, trim them to a low mound now before new growth gets tall
• Spring is a good time to dig and divide an established clump if you want more plants for another bed
• Water new spring transplants regularly for the first few weeks. Established plants can rely on rain

A quick spring cutback of last year's stems keeps the bed looking tidy just as the rest of the yard wakes up, an HOA-friendly start to the season.

Summer

Summer is dittany's easiest season, since Hot Springs' heat and dry stretches are exactly the lean, rocky, well-drained conditions this plant is built for.

• Full sun to part shade suits it well, and established plants take Arkansas' hot, humid summer stretches in stride
• Skip supplemental watering on established plants. Soggy summer soil is more likely to hurt this plant than a dry spell
• The narrow aromatic leaves and low mounded shape, 9 to 18 inches, hold their form through summer without staking or shearing
• Flower buds are setting through mid to late summer, with the purple to white blooms opening toward August

Its compact, self-contained mound needs no summer shearing to stay neat along a front walk or bed edge, an HOA-friendly low-maintenance look.