Before you seek a source, understand what you are buying. We are not true bulbs like tulips or daffodils; we are corms, which are solid, swollen stem bases. A quality corm is the key to our vitality. Look for firm, plump corms that feel heavy for their size, showing they are full of stored energy. The outer tunic (the papery covering) should be intact and healthy, not mushy or moldy. A large, high-quality corm will produce a stronger plant with a more impressive flower spike, as it contains more reserves to fuel growth before the new leaves can photosynthesize sufficiently.
From our perspective, a reputable online vendor demonstrates a deep understanding of our needs. They provide critical information that aligns with our botany. First, they should specify the corm size, often listed as a measurement in centimeters or by a grade like "Jumbo" or "#1." Larger corms yield more and sometimes earlier flowers. Second, they must offer a diverse selection of species and cultivars. While most garden varieties are hybrids (Gladiolus x hortulanus), a supplier offering species Gladiolus, such as Gladiolus communis or Gladiolus byzantinus, shows a commitment to genetic diversity and hardier, naturalizing varieties. This diversity is crucial for ecosystem resilience.
Several nurseries have built their reputations on the health and authenticity of their plant material, which is paramount for us.
1. Specialty Bulb Companies: Vendors like Longfield Gardens and Brent and Becky's Bulbs are excellent choices. They specialize in geophytes (plants with underground storage organs like our corms) and handle their stock with care. They typically source high-grade corms, store them in optimal conditions to prevent desiccation or rot, and ship them at the correct planting time for your zone. Their detailed product descriptions and planting guides reflect a plant-centric approach.
2. Native Plant Nurseries: For gardeners interested in supporting local ecosystems, seek out nurseries like Prairie Moon Nursery or American Meadows. They often offer North American native species or non-invasive cultivars. Planting species adapted to your region reduces the need for supplemental water and fertilizers and provides better resources for local pollinators, creating a more symbiotic relationship with the environment.
We gladiolus have a distinct growth and dormancy cycle. A quality supplier respects this cycle. They ship corms when they are fully dormant and at the appropriate time for planting in your USDA Hardiness Zone. Planting too early in cold, wet soil will cause us to rot. Planting too late may not give us enough time to mature and store energy for the next season. A good company will allow you to select a shipping date that aligns with your local last frost date, ensuring we arrive ready to break dormancy and grow immediately upon planting in warm soil.
Be wary of suppliers selling corms at prices that seem too good to be true. These are often small, weak, or improperly stored corms that lack the vigor to produce a strong flower spike. Furthermore, ensure the supplier has a clear phytosanitary certification process to prevent the introduction of soil-borne pathogens like Fusarium rot or thrips pests, which can devastate not only us but your entire garden. A healthy start is the most critical factor for our success in your landscape.
