Unpack bare roots or rhizomes on arrival and plant them within a week. Until then, keep them somewhere cool and ensure the roots remain slightly moist, never wet.
Out of season
Helianthus
'Happy Days'
sunflower
Helianthus 'Happy Days' is a stunning dwarf perennial sunflower. Dramatic bright yellow flowers, with double centres, are produced from July to September, on stems just 90cm / 36" or so high. Leaves are dark green, toothed and pointed, and make a great backdrop for the yellow blooms. The plants are slim, at just 60cm wide. Happy to grow in most good garden soils, in a sunny spot, this Helianthus is a useful late-flowering plant for the middle of a border. And it does not run amok, like some types!
Bees and butterflies love the flowers, which are also great to use as cut blooms for indoors; they also dry well for long-lasting indoor decorations. Helianthus 'Happy Days' is so highly regarded by experts, that the Royal Horticultural Society (RHS) has given it the coveted Award of Garden Merit.
Quantity
Plant profile
Plant calendar
Remove the packaging straight away, check the compost and water thoroughly if dry. Check the plant’s hardiness before placing it outdoors. Plant into a border or permanent container within a month, choosing the position recommended for the variety. Keep the top of the root ball level with the surrounding soil, firm gently and water well.
Soak the roots in water for three to six hours immediately before planting. Keep any crown, buds or emerging shoots above the water where possible.
Pot most bare roots into 15–20cm pots filled with peat-free multipurpose compost. Large or depth-sensitive roots, including peonies, are often best planted directly into borders.
Arrange the roots naturally without bending them. Cover the roots completely, positioning the crown and buds at the depth recommended for that particular perennial.
Keep pots in a sheltered outdoor position and water whenever the compost begins to dry. Grow on until roots hold the compost together when lifted from the pot.
Plant into a suitable border or permanent container once well rooted. Add a label and water regularly throughout the first growing season while the perennial establishes.
- Botanical name
- Helianthus 'Happy Days'
- Flower colour
- Yellow
- Established height
- 50-70cm
- Established spread
- 50-70cm
- Growing skill
- Easy to grow
- Habit
-
Upright
Clump-forming - Hardiness
- Fully hardy
- Leaf colour
- Green
- Mouse resistant
- Yes
- Plant size
- 1
- Plant spacing
- 16 plants per m2
- Pollinator friendly
- Yes
- Position
- Sheltered
- Rabbit resistant
- Yes
- RHS Award (AGM)
- Yes
- Scented
- No
- Soil acidity
- Any
- Soil moisture
- Free draining
- Soil type
-
Loam
Multipurpose compost
Loam-based compost - Suitable for
-
Pots
Large containers
Borders
Gravel gardens
Wildlife gardens
Cottage gardens
Low maintenance gardens
Cut flower gardens - Sunlight
- Full sun
- Toxicity
- No report
- Years to establish
- 1-2 years
Good for cutting
Perfect for pots
Pollinator-friendly
Thrives in full sun
RHS Recommended
Perennial
Fully hardy
Packed peat-free
Low maintenance
Attracts wildlife
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