Galeopsis Pubescens

Large-flowered hemp-nettle thrives with ample sunlight, though it can also tolerate moderate light. Sunlight is important for its healthy growth, but excessive or insufficient sun can stress the plant. Its native habitat was open areas that receive plentiful natural light.

Large-flowered hemp-nettle can adjust to a broad spectrum of temperature conditions, although its distribution may still be constrained by various combinations of moisture and heat. It grows best in warm summer climates with sufficient rainfall or watering. Extended periods of cloudy, rainy weather, as well as prolonged high temperatures, can raise the risk of Large-flowered hemp-nettle dying. In winter, adequate protection from cold can increase the plant's chances of survival.

When most of the Large-flowered hemp-nettle's blooms have opened to full size, resume fertilizing. Begin fertilizing around the time bloom production is at its peak, applying fertilizer once every three to four weeks as the weather allows. Then, after the Large-flowered hemp-nettle begins to produce fewer new blooms, cease fertilizing; there is no need to fertilize when the plant can no longer produce additional blooms.

To promote healthy growth, prune downy hemp nettle—characterized by its hairy stems and purple flowers—in early to late spring. Trim away any dead or damaged stems to encourage new shoots and prevent overcrowding. It is important to use clean tools to avoid disease, which will enhance flowering and improve the overall vigor of the plant.