Twin Oaks Valley Greenhouses
$3.25–$8.00Distance unavailable · 2245 North Twin Oaks Valley Road, San Marcos, CA 92069
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trefle.io · Taken Nov 29, 2016 by Rodrigo Castillo (cc-by-sa)
Asteraceae
Sunflower
Helianthus annuus
Also known as Annual sunflower, Mirasol, Common sunflower, Helianthus annuus californicus
Zones 4–9Sun Full SunWater ModerateCare Low
Flowering Plants · Native Plants · Sunflower · Annual · Cut Flower · Pollinator · Easy-Care · Garden · Seeds · Bright · Cottage Garden · Wildlife
PopularPet-safeBeginner-friendlyAttracts pollinators
In stock at 2 nurseriesStock updated 9/9/2026
Sunflowers thrive in full sun and well-draining soil, requiring at least 6-8 hours of direct sunlight daily. Water regularly at the base to keep soil evenly moist, avoiding overhead watering that can promote disease. They are fast-growing and low-maintenance, making them an excellent choice for beginner gardeners and pollinator-friendly landscapes.
Growing conditions
The details behind the basics
- Daily light
- 8 hours
- Watering
- Water deeply at the base until soil is thoroughly moist, then allow the top inch to dry before watering again · Every 7-10 days
- Maintenance
- Low
- Soil
- loam
- Soil pH
- 5.5–7.8
- Temperature
- -25°F to 85°F
- Cycle
- Perennial
- Propagation
- Seed, Division
Hardiness
USDA 4b-9b
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Form & growth
Mature size and habit
- Mature height
- 12 in – 3 ft
- Spread
- 2 ft
- Spacing
- 24 in apart
- Growth rate
- Fast
- Root depth
- Medium
- Flowers
- Yes
- Foliage
- Coarse
Ecology & origin
Where it belongs and what it brings
- Native to
- Alabama, Alaska, Albania, Alberta, Altay, Amur, Argentina Northeast, Argentina Northwest, Argentina South, Arizona, Arkansas, Assam, Austria, Azores, Baltic States, Bangladesh, Belarus, Belgium, Belize, Bolivia
- Attracts
- Bees, Butterflies, Birds
Sources: trefle, usda
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