Before seeking a purchase, it is crucial to understand that "Lobelia" refers to a large genus with both annual and perennial species, each with distinct growing requirements. The two most common ornamental types are Lobelia erinus, a tender perennial typically grown as an annual, known for its cascading blue, purple, or white flowers ideal for containers and borders; and Lobelia cardinalis (Cardinal Flower), a hardy perennial native to the Americas, celebrated for its stunning, vibrant red spikes that attract hummingbirds and thrive in moist, wetland-like conditions. Your choice between seed and plant, as well as the vendor, will depend on which species aligns with your garden's environment and your horticultural goals.
For gardeners seeking established plants to achieve blooms within a single season, specialized online nurseries are the most reliable source. These vendors often ship plants as plugs or in small pots, ensuring a healthy root system. Look for nurseries that specialize in native perennials for species like Lobelia cardinalis or Lobelia siphilitica (Great Blue Lobelia). These providers typically cultivate their stock with care, reducing the risk of introducing diseases to your garden. When ordering plants online, prioritize vendors that provide detailed growing information and guarantee the health of their plants upon arrival. Purchasing plants is often the best method for perennial varieties, as it bypasses the longer germination and establishment period required from seed.
For the patient gardener or those looking to cultivate a large number of plants, starting from seed is a cost-effective option. Numerous established American seed companies offer packets of both annual and perennial Lobelia seeds. These companies often provide a wider variety of cultivars than what is available as started plants, including unique colors and hybrid strains. When purchasing seeds, it is essential to check the seed packet or product description for information on germination requirements; many perennial Lobelia seeds, for instance, require a period of cold stratification (a模拟冬季) to break dormancy and germinate successfully. Reputable seed vendors will provide these critical cultivation details.
Ensuring you receive healthy plants or viable seeds involves careful vendor selection. First, always verify that the seller has positive reviews and a clear phytosanitary or quality guarantee. Second, check the USDA Hardiness Zone information for perennial species to ensure they are suited to survive in your local climate. For plants, inspect the product images for signs of vigorous growth—green leaves, strong stems—and avoid any that appear leggy or wilted. For seeds, check the packaging for a "packed for" date to ensure freshness, as older seeds have lower germination rates. Finally, consider the shipping timing; bare-root or potted perennials are best shipped in early spring or fall, while seeds can be shipped year-round.
