
Planting bulbs is a beautiful way to add a splash of color and variety to your garden. But how well do bulbs do in Denver? According to the USDA Plant Hardiness Zone map, Denver is considered a zone 6a. Its sandy, alkaline soil and a mild, semi-arid climate characterized by mild winters, lots of sunshine, and high humidity can support a wide variety of plants, including bulbs. As you prepare your garden in time for this year’s planting season, here is what you need to know about planting bulbs in the Denver area.
What are Bulbs?
Bulbs are plants that store their food in an underground storage organ. Classified as either annuals or perennials, the bulb is a survival mechanism that allows such plants to survive periods of dormancy, such as winter or dry periods, after which they emerge during the next growing season. Perennial bulbs are an especially great addition to your garden as they keep coming back year after year with minimal effort.
Planting and Care
To ensure a successful growing season, timing is important. Spring-flowering bulbs, such as daffodils, tulips, and hyacinths, are best planted in the fall, preferably in October. They go dormant during winter then spring up and bloom in spring. If planting late in the fall, aim for not less than six weeks before ground freezing to give your plants enough time for rooting.
Plant summer-flowering bulbs such as lilies, dahlias, and gladioli early to late spring. Some gardeners plant autumn-flowering bulbs in late summer.
Plant your bulbs at 3-4 times their depth in well-draining soil with the shoot facing upwards. Water generously immediately after planting and in regular intervals throughout the growing season. Consider fertilizing after blooming to promote good flowering in future seasons. Lightweight mulching in winter helps maintain a cool temperature while keeping weeds at bay.
What Bulb Types Are Easier to Grow in the Denver Area?
Bulbs thrive when planted in loose, well-draining soil, which is what you will find in most gardens in Denver. Generally speaking, tulips (especially Triumph and Darwin varieties), daffodils, alliums, grape hyacinths, crocuses, snowdrops, and iris do great here.
Some bulbs, such as snowdrops and Dwarf iris, bloom early while others, such as alliums, bloom later in the season. With careful planning, you can have weeks of bloom both in spring and summer. Since some naturalize easily and rapidly, they will keep coming back yearly, adding a gorgeous pop of color to your garden.
Which Bulbs Are More Difficult Due to Cold or Hot Weather?
While most bulbs are tough and hardy, some struggle to thrive in certain places due to extreme temperatures. Some bulbs require winter chill, while some are highly susceptible to frost requiring lots of sunshine to flower properly.
Bulbs native to tropical regions (eg. cannas, dahlias, and gladioli) thrive in warm, humid climates. These may be a little difficult to grow in Denver due to cold weather and will need to be moved indoors during winter.
Other bulbs, such as daffodils and tulips, struggle to thrive in hot weather and may not flower properly. For best results, plant such bulbs in the fall to allow for a period of dormancy in winter so they can unfurl their blossoms in spring.
Shop Our Massive Variety of Bulbs at Nicks
At Nicks, we remain committed to helping you create a thriving garden. This gardening season, we invite you to explore our massive selection of bulbs to pick up plants to add to your collection. From spring to summer blooms, we have bulbs for every Denver garden. We are also happy to provide planting instructions, recommend garden designs, and tips and tricks for a colorful garden. Visit our garden center or contact us today for more information.
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