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Science-based gardening information for Colorado communities from CSU Extension, Denver Botanic Gardens, and Green Industries of Colorado.

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2008 – Commonly Used Plant Terms

Annual — Plants that grow, flower, and die in one growing season. Marigolds, cosmos and zinnia are among many common annuals. Perennial — Plants that return over multiple seasons. Perennials normally live for three or more growing seasons. Trees, shrubs, and many flowers and some vegetables are perennial. Rhubarb, asparagus, chrysanthemums and Iris are a […]

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1010 – Bulbs: Maintaining

Gardeners dutifully buy and plant more and more Dutch bulbs every autumn. In wet climates, many of these bulbs would rot in humid summer conditions. But in our sunny, dry climate, bulbs often return and even naturalize, forming dense clumps of color from a single plant. Groupings of naturalized bulbs can be divided, much like […]

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1067 – Deer Resistant Bulbs

Certain bulbs are observed to be deer resistant. Members of the Narcissus genus (daffodils) are a popular choice because deer tend to avoid them. Daffodils come in a range of colors and a variety of sizes from petite rock garden varieties to large blooming cultivars. To stagger bloom period over several weeks, plant early, midseason […]

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1011 – Bulbs: Selecting

When gardeners say the word bulb, it can mean several things. In horticultural terms, these plant parts refer to the underground food and water-storage organs of certain plant species that are valued for their flowers. What should I consider when selecting bulbs? When selecting bulbs, consider several factors before you buy. It’s critical to know […]

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Annuals & Perennials

Annuals Perennials General Information Water Gardens Annuals (need to be planted each year) Alpine ivy geraniums Amaranths Annual flower trials Annual flowering vines Annuals Basil Geranium types Growing geraniums Heat loving replacement anuuals for containers Marigold Pansies for seasonal color Pansy Parsley Petunia Salvia Shade gardens: annuals Sunflowers Go to top of this page. Perennials […]

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