Helianthus annuus (Sunflower)
The sunflower is an annual plant that can grow from 40 cm to almost 8 m in height, depending on the cultivar.
Its large flowers are very popular in gardens and there are a large number of ornamental cultivars, in addition to many agricultural cultivars.
These are usually yellow, but they can also be of various shades of red, orange and brown.
Dwarf cultivars are suitable for large pots, but most cultivars are too large to be grown in pots, and are normally grown only in borders or open fields.Common name: Sunflower, Sunflower
Scientific name: Helianthus annuus
Plant type: Annual / Biennial
Habit: Columnar / Upright
Height: 1.5m - 3m
Spread: 50cm - 1.5m
Flower color: Brown, Orange, Red, Yellow
Season of interest: Summer
Sunlight: Full Sun
Soil: Chalk, Clay, Loam, Sand
Moisture: Moist but well drained
Garden type: Informal Garden, Wildlife Gardens
Planting type: Cut Flowers, Flower borders and bedding, Wall-side Borders
Other characteristics: Flowers for pollinators
It adapts well to almost any type of climate, but the temperature should not drop below 5°C during the growing period.
Plant in full sun positions. The flowers will move to be always pointing to the sun during the day, that is why they are commonly known by sunflowers.
The soil must always remain moist, but not soaked.
Plant sunflower in a fertile, deep soil, rich in organic matter and well drained. This plant tolerates a wide range of soil pH, but the ideal is a pH between 6 and 7.5.
It usually starts to bloom about 2 months after germination.
Propagate sunflower by seed, which should be sown at a depth of approximately 2 cm. Germination of sunflower seeds is fast and usually takes a few days to two weeks.