When it arrives
Your plug tray
Plant plugs after frost in full sun or pot into 4 in pots first. Keep moist while they root. Pinching tips once in late spring makes bushier, sturdier plants.
Made with this by our community
Real dishes from our Field Notes recipes, shared by the people who made them.
Sundial grown by our community
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- Mature height
- 54.0 in
- Mature spread
- 42.0 in
- Bloom
- Early-July – peak Early-August
- Fragrance
- None
- Deer
- Moderately resistant
Lavender companion · grow guide
How to grow Sundial
False Sunflower · Heliopsis helianthoides
False sunflower wants full sun and average, well-drained soil. It's a tough native that blooms from early summer into fall and handles heat, drought and poor soil.
Check my zone & planting dates
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Full sunLight
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Moderate waterAverage drainage
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pH 5.5–8.0Soil
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Zones 3a–9bHardiness
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54″ tall42″ wide
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ResistantDeer · rabbits resistant
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Not known toxicPets
Huckleberry saysTell me where you grow and I’ll check if Sundial will thrive there.
Hardy in zones 3a–9b
Spring or early fall.
Your year with Sundial
JFMAMJJASOND
When to plant
Spring or early fall.
How deep
Set the crown level with the soil surface, buds just at or below the surface.
Spacing
About 2–3 ft apart; taller cultivars need the most room.
Soil
Average loam; tolerates clay, sand and poor soils · pH 5.5–8.0
Fix-it tip: No special amendments needed. In very rich soil it grows tall and floppy; lean soil keeps it sturdy.
Sun
Full sun (tolerates part sun).
In shade, stems get weak and floppy.
Don’t give up on it
Is it alive? What spring looks like
Shoots appear in mid-spring, often with dark, reddish new leaves on variegated or dark-leaf types. Growth is quick once soil warms.
Spring
Cut back old stems; pinch or trim tall types in late May.
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Summer
Long bloom; deadhead.
Fall
Leave seed heads for birds.
Winter
Leave stems standing.
Watering
First season: Water deeply weekly the first summer.
After that: Tolerates dry soil once established; water in long droughts to keep it blooming.
Feeding
Usually none needed. A light compost layer in spring is plenty.
Pruning & deadheading
Deadhead to extend bloom. Cutting stems back by about a third in late May makes shorter, sturdier plants. Leave seed heads for birds in fall, or cut back to limit self-sowing.
Dividing
Every 3–4 years in spring when the center thins.
Winter
Hardy to about zone 3. Leave stems standing for birds; cut back in spring.
Summer heat
Takes heat and humidity. Taller types may need staking or a midsummer trim.
Tall stems flop in rain
Likely cause: Rich soil or shade
What to do: Cut back in late May; stake tall types; give full sun.
Clusters of small insects on stem tips
Likely cause: Aphids
What to do: Spray off with water or use insecticidal soap.
Seedlings popping up around the bed
Likely cause: Self-sowing
What to do: Deadhead before seed sets, or pull seedlings in spring.
Too wet or too dry?
Wilting and crisp lower leaves: too dry. Yellow, rotting stems at the base: soggy soil.
Watch for
- Aphids
- Powdery mildew in crowded beds
- Few serious problems
Pets & wildlife
Not listed by ASPCA; no known toxicity reported. Discourage pets from chewing any garden plant.
Deer: resistant · Rabbits: resistant
Finnegan saysStill not sure what’s wrong? Ask Plant Health — describe it or add a photo.
In a container
Good in pots · 3 gallon+
Compact cultivars work in large pots; water more often than in the ground.
Indoors
Outdoor plant
Needs full sun and winter dormancy outdoors.
Winter chill
No chill needed
Usually blooms the first summer; established plants bloom more heavily.
Growing it on
Plugs from the tray
3–4 inch pots for 3–5 weeks, until roots hold the soil
Garden bed or a 3 gallon pot
Time to move up? Slide the plant out: if white roots wrap the outside of the soil, it’s ready for the next size.
Planting with lavender
Plant it near your lavender
Shares full sun and tolerates dry soil, but it's taller and lusher. Plant it behind or beside the lavender bed so gold daisies back up purple spikes without shading them.
Same bedNearbyIts own area
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