With its yellow flower discs, it shines to compete with the summer sun. The slightly smaller flower size compared to annual helianthus makes up for the perennial sunflower with its impressive appearance and robust longevity. Read here what care is really important for this majestic flower beauty.
How do you care for a perennial sunflower?
The perennial sunflower requires abundant and regular watering and a sunny location. Fertilize every 8-14 days during the growing and flowering period, cut off wilted flower stems and diseased shoots, and provide protection from frost in winter. A root barrier can prevent unwanted spreading.
How often should the perennial sunflower be watered?
Water a sunflower abundantly and regularly. Since moisture evaporates quickly in a sunny location, watering twice may be necessary on warm summer days. Apply the irrigation water directly to the root disk in the early morning and in the evening.
When and how is the perennial helianthus fertilized?
Sunflowers are characterized by their high nutrient requirements. Fertilize the magnificent flower every 8 to 14 days during the growth and flowering period with compost (€10.00 on Amazon), horn shavings and lime. Additionally, spray the root slice monthly with nitrogen-rich nettle manure. In September, stop supplying nutrients so that the plant prepares for the coming winter.
How do I properly cut sunflowers as a perennial?
There are various occasions when it is advisable to use pruning shears on sunflowers. How to cut the monumental summer beauty correctly:
- Cut back wilted flower stems as soon as possible in the hope of rebloom
- Cut off stunted or obviously diseased shoots and leaves
- In autumn, shorten the flower stem to 20 cm
Since sunflower seeds are an invaluable source of food for the garden's birds in winter, nature-conscious gardeners leave the sunflowers in the bed until early spring. Only then is the perennial cut to a hand's width above the ground.
Is winter protection necessary?
Perennial sunflowers are assigned to winter hardiness zone Z7. The frost hardiness extends to a range between -12.3 and -17.7 degrees Celsius. In harsh winter regions, we still recommend protection against bitter frost. Spread a layer of autumn leaves and coniferous twigs over the root disk.
Place perennial potted sunflowers on a block of wood in front of the south wall of the house. Cover the vessel with a warming layer of jute, fleece or bubble wrap.
Tip
Characteristic of the perennial sunflower is its vehement urge to spread. To prevent a perennial helianthus from taking over the entire garden over time, it should be planted in combination with a root barrier. Boards embedded in the planting pit, an impenetrable geotextile or concrete blocks keep rampant roots in check.
