Perennial sunflowers, also known as Helianthus, have a tendency to spread relatively fast due to their rhizomatous nature. Rhizomes are underground stems that grow horizontally and produce new shoots and roots. This allows perennial sunflowers to expand their presence in the garden over time.
When planting perennial sunflowers, it is important to provide enough space for their rhizomes to spread. Leaving a distance of 2 to 3 feet between divisions or individual plants is recommended. This gives them room to grow and prevents overcrowding, which can lead to competition for nutrients and limited growth potential.
While perennial sunflowers are generally low maintenance plants, some of the taller varieties may require additional support to prevent them from flopping over. This is especially true for those with large flower heads. Staking is a common technique used to keep the plants upright. You can insert stakes into the ground near the plant and tie the stems to them using soft plant ties or twine. This helps to provide support and keep the plants looking their best.
Alternatively, if you have a garage or a wall in your garden, you can plant the tall sunflowers alongside it. The structure will act as a natural support system, eliminating the need for staking. Additionally, planting them behind other tall perennials can also provide support and create a visually appealing backdrop for the garden.
In my personal experience, I have grown perennial sunflowers in my garden for several years. I have observed that they do indeed spread relatively quickly, especially when provided with favorable growing conditions. The rhizomes have a tendency to explore the surrounding soil and produce new shoots, resulting in a larger plant colony over time.
To summarize, perennial sunflowers have a spreading habit due to their rhizomes. Providing enough space for their growth and considering additional support for taller varieties are important factors to consider when cultivating these plants. With proper care and maintenance, perennial sunflowers can add a vibrant and beautiful touch to any garden.
