Bush Sunflower

Year-round

Bush Sunflower is a tough, sun loving perennial that needs sharp drainage most of all to do well in the Dallas area.

• Give it full sun, at least six to eight hours a day, for the best bloom and a compact shape.
• Good drainage matters most. The heavy Blackland clay common around Dallas holds water, so plant on a slope, in a raised bed, or work some coarse sand or expanded shale into the soil first.
• It grows a deep taproot and becomes very drought tolerant once established, usually after its first full growing season.
• Water deeply but not often once it is established. Overwatering in clay soil is the most common way people lose this plant.
• Expect a mounding, bushy shape roughly one and a half to three feet tall and wide, with small yellow daisy like flowers.
• Deer tend to leave it alone, which is useful for an unfenced front yard.

Fall

Bush Sunflower keeps blooming into fall in the Dallas area right up until the first hard freeze knocks it back.

• Blooms typically continue into October and sometimes November here, tapering off as nights cool.
• Deadhead spent flowers through October to keep new blooms coming and to limit how much the plant reseeds itself.
• NWS records put the Dallas-Fort Worth average first freeze around November 22. Expect the top growth to blacken and die back around then.
• Cut back watering as growth slows in fall. This is a naturally low water season for the plant here.
• Once frost kills the top growth, it is fine to leave the dead stems standing through fall. Save the hard cutback for late winter.

Deadheading through October keeps the front bed looking cared for while the plant is still blooming.

Winter

The plant goes fully dormant after the first hard freeze and spends winter as a bare crown and root system.

• Top growth dies back to the ground after a hard freeze, typically by late November in the Dallas area.
• Cut the dead stems back to a few inches above the ground in late winter, before new growth starts underneath.
• No need to water a dormant plant unless Dallas goes an unusually long stretch without any rain.
• Good drainage matters in winter too. A taproot sitting in cold, wet Blackland clay is a common way to lose the plant, more so than the cold itself.
• Because it dies back completely, the spot will look bare from the first freeze until new spring growth. Nearby evergreen plants help keep the bed from looking empty.

Cutting the dead stems back in late winter keeps the bed from looking dead once neighbors' spring color starts coming in.

Spring

Spring is when Bush Sunflower wakes back up from winter and starts pushing new growth from its base.

• New growth resumes from the base once nights stay reliably above freezing. NWS records for Dallas-Fort Worth put the average last freeze around March 12.
• If the dead winter stems were not already cut back, trim them down to a few inches before the new shoots get much taller, so growth does not have to push through old dead wood.
• Spring is normally the wettest stretch of the year in Dallas, so hold off on extra watering until the rain slows. Soggy Blackland clay is more likely to rot the taproot than a dry week is to hurt the plant.
• Some early leaf chewing is normal. Bush Sunflower is a documented host plant for the Bordered Patch butterfly, and the plant regrows quickly.
• A light layer of compost or mulch pulled back from the crown can help once new leaves are a few inches long, though it is not required.

Summer

Dallas summer heat and dry spells are exactly the conditions this plant is built for, once it has a season of roots under it.

• Water deeply but infrequently, roughly every 10 to 14 days in a real dry stretch, less if there has been rain.
• By mid to late summer the plant can get leggy and open up in the middle. Cutting it back by about half brings on a fuller, more compact rebloom before fall.
• Skip fertilizer. Rich or overly wet Blackland clay tends to produce a floppy plant with fewer flowers, not a better one.
• Full sun and heat are not a problem for an established plant. Wilting in the hottest part of the afternoon and bouncing back by evening is normal, not a sign it needs more water.

A mid-summer cutback keeps the plant from sprawling over a front walkway or bed edge and gives it a tidier second bloom.