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Perennials

Perennials are the cornerstones of our garden borders, providing vibrant flowers year after year.

Plants that live for more than two years are known as perennials; their Latin name means "through the years." They bloom generally in the spring, summer, or fall, with a few blooming in the winter, and many have lovely foliage as well. Herbaceous perennials are those that die back to the ground in the autumn and sprout in the spring. Some, on the other hand, are evergreen and keep their leaves throughout the year.

There are perennials for every style of garden, for any aspect or soil type, and they come in a variety of sizes, from small plants for the front of a border to medium-sized plants for the center.

Perennials come in a variety of sizes and shapes, ranging from low-growing plants for the front of a border to medium-sized plants for the middle, and giants a couple of meters tall for the back. They take swiftly to establish and expand, with most plants reaching full size in just a few growing seasons. Many perennials make great cut flowers, and the more compact species are ideal for container gardening. The blossoms on the majority of them are particularly attractive to pollinators.

With over 30 years experience dealing with the unique challenges that Colorado's climate poses, we have all the perennials that thrive here in the Rocky Mountain region. Here are just a few of the hundreds of Rocky Mountain Perennials you can find at all three O'Toole's Garden Center locations.


Shade Perennials


Part Sun/Part Shade Perennials


Full Sun Perennials

25% Off All Trees & Shrubs

Valid June 29-30, 2024

Summer is a great time to plant trees and shrubs, and we're putting all of our 2024 inventory on sale! All Trees and Shrubs are 25% off!

Chris Ibsen

Store Manager – Littleton

Over 30 years with O’Toole’s! A true gardening  expert! Email Chris Favorite plant: Evergreen

2023 Garden Giveaway Winners

Thank you to everyone who participated in the 2023 Garden Giveaway contest! It’s so fun to see how your gardens take shape after meeting you while shopping in our stores.   First Place @js_customs8   View this post on Instagram   A post shared by John (@js_customs8) “I’ve been working on my garden and landscape for 25 years,” says JS, …

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Did you know that after May 2, there’s a still 50% chance of frost in Denver? Don’t let that stop you from getting your garden started now! O’Toole’s offers frost blankets and other products to help protect your plans from hard freezes. If you’re a vegetable gardener, we recommend this Insulated Plant Protector/Mini Greenhouse from Dalen. Tubes of water to insulate young …

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As the weather turns colder, many gardeners are ready to pack up their tools and wait until spring to start planting again. But why wait when you can start growing delicious winter crops? At O’Tools, you can find a variety of bulbs and plants perfect for winter gardening, including shallots, onions, and garlic. When planting shallots, it’s important to remember …

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2020 Garden Giveaway Winners!

September 18, 2020
It was so inspiring to see all the creativity and gardening passion out there! Check out the winners of our 2020 Garden Giveaway! Read Full Blog Entry…
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Ask a Gardener – Japanese Beetle
June 11, 2020
Japanese Beetles damage plants as both adults and larvae. Adults feed on soft leaf tissue, leaving skeletonized foliage. Larvae feed on roots, especially turf grass, leaving dead, brown patches in the lawn. Cech out this blog entry for tips and products to address both the larvae and the adult bugs. Read more