Colorado Gardening Resources

Read our Q & A postings answering common Colorado gardening questions here. Keith Funk is handling these this year. You can also hear him on the Garden Wise Radio Show on Legends 810AM, every Saturday morning from 7-9.

Special thanks to Kelly Grummons for thoughtfully answering these questions for many previous years.

Have gardening questions? Click here to send us your question on our contact form. Use our search window below to find Colorado gardening questions & topics.

Leaf miner on Spinach

Q: Every year my spinach gets leaf miner making the leaves inedible. How do I get miner free spinach?

Apr 32 min read

Where to hang bird houses

Q: When I install a bird house, should it be attached to a surface that doesn’t move, or is it okay to hang it from a branch.

Apr 31 min read

How to keep wasps out of birdhouses

Q: I have a wren house I want to put out this spring. Previous houses I’ve put up had wasp nests, I have heard of applying wax to the inside of the roof but haven't tried it. Do you have other suggestions?

Apr 31 min read

When to start tomato seeds indoors

Q: When should I sow tomato seeds indoors? A: Always check the seed packet. Most will tell you the number of weeks from sowing, to transplanting outdoors. As a very general rule of thumb, determine the date you plan to transplant your tomatoes outdoors in the garden and count back 6-8 weeks for your sowing date. For instance, I like to plant my tomatoes out Memorial Day weekend. This year it falls on May 25th. So my indoor sowing date will be the week of March 30th. For slo

Feb 261 min read

Fiddle Leaf Fig Care

Q: I was just given a fiddle leaf fig but have no idea how to take care of it. Can you give me some pointers?

Feb 261 min read

When to Prune Lilacs

Q: My lilacs are overgrown and need to be pruned back. When is the best time to do this? A: For spring flowering shrubs that flower before Memorial Day, pruning should wait until after flowering. They can be pruned earlier than that if you have no choice, but you will be sacrificing this spring’s flowers in the process. This would include shrubs like lilac, forsythia, quince, pussy willow, mock orange, most viburnums and spring blooming spireas. Flowering shrubs that flower

Feb 261 min read

Winter Watering in Colorado

Q: It’s been such a dry winter I’ve been watering my landscape about once a month. Should I water more often now? A: Good for you taking the time and care to winter water your outdoor plants. We have just been through one of the driest winters on record and the snow pack we rely on is severely lacking. It’s time to take a serious look at what that means for our landscapes this spring and summer.

Feb 262 min read

Garlic Sprouting in Winter

Q: I’ve noticed my garlic has sprouted some leaves above ground already. Is that a problem?

Feb 31 min read

Clematis Breaking Bud Early

Q: I know clematis like to start growing very early in the spring, but mine have already start to break bud. I’m assuming it’s due to our unusually warm weather this winter. How do I handle that?

Feb 31 min read

Clivia Plant Problems

Clivia Q: My Clivia plant of 15 years has been declining and no longer flowers. What could be the trouble? A: Clivias are beautiful, long lived houseplants known for their striking clusters of flowers and strap shaped leaves. They like bright, indirect light, well-draining soil, and infrequent watering, allowing soil to dry between waterings to prevent root rot. They also like a rest during the winter months to encourage spring blooms. Feed monthly during spring/summer with

Feb 31 min read

Wildlife Habitat Certification

Q: I’ve heard that homeowners can get their property certified as a Wildlife Habitat. How do I do that? A: In Colorado, you can certify your property as a wildlife habitat through the National Wildlife Federation (NWF) by providing food, water, cover, and places to raise young, using native plants and sustainable practices, with local support from organizations like the Colorado Wildlife Federation and Wild Birds Unlimited . Communities, schools, and businesses can also jo

Feb 31 min read

Feather Reed Grass Problems

Q: Three of my Feather Reed Grass clumps have fallen over sideways. When I went to clean them up, I noticed they were no longer attached to the ground. It looks like the tops were severed from the roots just below ground. What’s going on?

Feb 31 min read

Improving Your Vegetable Garden

Q: I’m going to attempt a vegetable garden one more time next spring. Every year, the results of my efforts aren’t very great. The root crops don’t get very big. The tomatoes get some disease and the squash always get mildew. Is this from bad soil or a bad gardener? What are some things I can do to improve our garden? If it doesn’t work out next year, I’m giving up. A: Oh no, don’t give up! I think if you boost your efforts just a little, you’ll have a much better crop next

Dec 4, 20252 min read

Bringing Succulents Indoors

Q: We love our succulent pots. We bring them indoors every winter. They are hard to keep healthy in our house. When I put them back outside in June, they are leggy and ugly. How can I do better with this? By the time they’ve recovered from their winter trauma, it’s winter again! A: Succulents are so popular and beautiful. When you bring them indoors for the winter, put them in as much sun as possible. If possible, keep them sunny and cool. A sunny mud room or extra bedroom w

Dec 4, 20251 min read

How to get indoor cactus to bloom?

Q: Over the last few years, I’ve collected a number of cacti and succulents. When I look them up online, it shows that they have gorgeous flowers. Mine never bloom. I have them in various windowsills and on tables near the window. Do they have to be older to flower? Do they need a certain kind of fertilizer?

Nov 5, 20252 min read

Some of the tropical plants I brought into the house to spend the winter are dropping leaves. What’s going on?

Tropical Croton plant Q: Some of the tropical plants I brought into the house to spend the winter are dropping leaves. What’s going on? A: It’s not unusual for plants to re-acclimate to indoor conditions when you bring them inside. Light levels are lower indoors and the air is drier. Give them time to adjust to their new conditions. Be sure to continue to feed them at least monthly through the winter to keep them as healty and possible. If they grew enough during the summer

Nov 5, 20251 min read

Mulching Perennials

Q: Does mulching my perennial beds help my plants survive the winter better? A: Absolutely – with one exception. Not only does it protect the root system from fluctuating soil temperatures, a 2-3” mulch also helps conserve moisture in the soil for good root growth until the soil freezes. I use the debris from my fall clean up once I’ve run it all through my shredder. A lawn mower will accomplish the same thing. I like it all chopped up because will decompose more quickly duri

Nov 5, 20251 min read

Is it too late to plant bulbs?

Q: Is it too late to plant spring flowering bulbs for next year? A: No, it’s not too late to plant bulbs right up to the time the ground freezes solid. This is a great time to find bulbs on sale at your local nursery. While the selection might not be extensive, any flowers are a welcome sight in spring. Be sure to water in your newly planted bulbs thoroughly and again in a month or so. They will start rooting out right away in preparation for spring and should not be allowed

Nov 5, 20251 min read

When should you use tree wrap?

Q: When should I apply tree wrap? A: The trunks of young, thin barked trees like maples, locust, linden and fruit trees will benefit from a commercial tree wrap to prevent sun scald for the first few winters. The general rule of thumb is ON at Thanksgiving, OFF at Easter. Read our Q & As with Keith Funk answering common Colorado gardening questions here. You can also hear him on the Garden Wise Radio Show

Nov 5, 20251 min read

Planting Mums in the Ground

Q: I received a beautiful big pot of mums as a gift. Can I plant these outside now? Just cut off the flowers & maybe separate into a few clumps?

Nov 5, 20251 min read

Should I remove all fallen leaves from my garden beds?

Should I remove all fallen leaves from my garden beds? A: Rake leaves from lawns to prevent snow mold, but a thin layer in garden beds can provide insulation and offer protection to overwintering wildlife.

Nov 5, 20251 min read

When to Harvest Winter Squash

Q: How do I know when my Acorn and Hubbard winter squash are mature enough to harvest and store well?

Oct 3, 20251 min read

Winter Watering Tulips & Daffodils

Q: I planted quite a few tulips and daffodils in September. Do I need to water them through the winter?

Oct 3, 20251 min read

Hydrangea paniculata 'Pinky Winky Prime'™. Photo: Proven Winners

When to Prune Hydrangea Paniculata

Q: I planted several varieties of Hydrangea paniculata this year and they were spectacular. Do I prune them now or in the spring?

Oct 3, 20251 min read

How to Correct a Leaning Tree

Q: My neighbors planted a plum tree two years ago. Over the past year and a half it started leaning over. They recently put some rope...

Oct 3, 20251 min read

Propagating Coleus

Q: I planted some pots of coleus last spring which have grown into beautiful plants. I’d like to keep them through for next year. They are too big to bring the whole plant inside. Are they easy from cuttings?

Oct 3, 20251 min read

Is September a good time to plant garlic?

Q: Is September a good time to plant garlic? A: Yes! Although garlic bulbs typically aren’t available at the garden centers until late...

Aug 29, 20251 min read

Can I still plant vegetables for a fall harvest?

Q: Can I still plant vegetables for a fall harvest? A: Absolutely! Fast growers like spinach, lettuce, kale, and radishes thrive in the...

Aug 29, 20251 min read

Fall-Blooming Perennials to Plant Now

Q: Every year, my perennial beds get boring as the summer flowers fade. They need some color to carry through autumn. Which fall-blooming...

Aug 29, 20251 min read

Reseeding Perennials and Annuals – When should I stop deadheading flowers?

Q: I enjoy perennials and annuals that reseed themselves from year to year. It’s such a pleasant surprise to see them pop up in new...

Aug 29, 20251 min read

When to Plant Spring Bulbs - Is September Too Early?

Is it too early to plant spring-blooming bulbs such as tulips, daffodils, and crocus? Or do I need to wait for cooler weather? A: It’s...

Aug 29, 20251 min read

Overwintering of Crocosmia

Crocosmia ‘Lucifer’ Q: I love Crocosmia ‘Lucifer’ but it doesn’t seem to want to winter over for me. What am I doing wrong? A: Crocosmia...

Jul 30, 20251 min read

Is it okay to fertilize roses in August?

Q: Should I feed my roses in August? I’d like to see them bloom again once the adult Japanese Beetles disappear for the year. A: Apply a...

Jul 30, 20251 min read

Zucchini Blossom End Rot - shriveling and yellowing fruits

Why do my zucchini keep shriveling up?

Zucchini Blossom End Rot Q: I’m growing zucchini in large pots on my deck. The plants look great but some of the young fruit look like...

Jul 30, 20251 min read

What's the difference between part sun and part shade?

Q: What's the difference between part sun and part shade? A: The terms "part sun" and "part shade" frequently appear in gardening books...

Jul 30, 20251 min read

Shiny Mahonia Repens

Q: I love mahonia repens for its durability in Colorado. I spread the seeds to increase growth to new areas. I have one seedling that is...

Jul 1, 20251 min read

Is it okay to plant flowers in with my vegetables?

Q: Is it okay to plant flowers in with my vegetables? A: It’s not only okay, it’s encouraged. Choose short-growing annuals that won’t...

Jul 1, 20251 min read

Bolted Lettuce and Spinach

Q: My lettuce and spinach plants have been great all spring but have suddenly produced tall stems from the center of the plants and the...

Jul 1, 20251 min read

How long do clematis bloom?

Clematis fremontii, a non-vining, herbaceous bush type Q: Do clematis continue blooming if you keep feeding & watering them? Mine...

Jul 1, 20252 min read

Good Pollinator Plants

Q: What are some good pollinator plants that support bees, butterflies, hummingbirds, and other beneficial insects? Swallowtail on...

Jun 5, 20251 min read

Can I still plant vegetables now, or am I too late for this growing season?

Q: Can I still plant vegetables now, or am I too late for this growing season? A: You can absolutely plant a vegetable garden now. Warm...

Jun 5, 20251 min read

How to Reduce Water Use in your Landscape

Q: My water bill was pretty high last summer. Is there anything I can do now to reduce water use this summer? A: Yes. There are...

Jun 5, 20251 min read

Can potted tulips, daffodils and Easter lilies be planted outside?

Q: I have some pots of spring bulbs like tulips and daffodils as well as a couple of Easter lilies. Can I plant them outside this...

May 16, 20251 min read

When to cut back geraniums

Q: The geraniums I overwintered indoor are scheduled to go back outside later this month but they have gotten leggy and unattractive. ...

May 2, 20251 min read

Best Mulch for Vegetables

Q: What kind of mulch is good for the vegetable garden and when should I start mulching? A: The when is based on the crop. Cool season...

May 2, 20251 min read

How deep should mulch be applied around trees and shrubs?

Q: How deep should mulch be applied around trees and shrubs? A: For existing plantings, add only as much mulch as it will take to...

May 2, 20251 min read

When to Divide Snowdrops

Q: My Snowdrops have finished flowering and the clumps are looking pretty crowded. When can I divide them? A: Unlike most spring...

Apr 1, 20251 min read

How to Transplant Water Lilies

Q: I’ve noticed my hardy water lilies are starting to send up leaves. They’ve outgrown their existing pots. Is this a good time to pot...

Apr 1, 20251 min read

Tomato Protectors

Q: I want to grow tomatoes and peppers this year. Do I have to wait until the end of May to plant them outside? A: There are ways to...

Apr 1, 20251 min read

When to Move Peonies

Q: Can peonies be moved this time of year? Mine are in too much shade and have stopped flowering. A: Early spring is an excellent time...

Apr 1, 20251 min read

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Colorado Gardening Resources

PLANT SELLERS & SEED COMPANIES

Long's Gardens Since 1905

DogTuff Grass

Miss Penn's Mountain Seeds

Cold Hardy Cacti & Succulents

Western Native Seed

Desert Blooms

PLANT SOCIETIES / GARDEN CLUBS

Denver Rose Society

Colorado Cactus & Succulent Society (CCSS)

Rocky Mt Chapter North American Rock Garden Society

Colorado Native Plant Society

Harlequin's Gardens Sustainable Nursery

Malara Gardens

Eaton Grove Nursery

Ricks Garden Center

The Flower Bin

Cliffrose Nursery

Fort Collins Nursery

Bookcliff Gardens

Jared’s Nursery, Gift & Garden Center

Al’s Pine Garden & Nursery

Bath Garden Center & Nursery

Tagawa Gardens

Harding Nursery

Nick's Garden Center & Farm Market

City Floral

Southwest Gardens

Phelan Gardens

Fox’s Garden Supply

GARDEN CENTERS & NURSERIES

PUBLIC GARDENS & EDUCATION

High Plains Environmental Center

Growing Gardens

Denver Botanic Gardens at Chatfield Farms

Plant Select

The Garden Wise Show

The Keep It Clean Partnership

Denver Botanic Gardens

Gardens at Spring Creek

Conservation Gardens at Northern Water

Leaf miner on Spinach

Where to hang bird houses

How to keep wasps out of birdhouses

When to start tomato seeds indoors

Fiddle Leaf Fig Care

When to Prune Lilacs

Winter Watering in Colorado

Garlic Sprouting in Winter

Clematis Breaking Bud Early

Clivia Plant Problems

Wildlife Habitat Certification

Feather Reed Grass Problems

Improving Your Vegetable Garden

Bringing Succulents Indoors

How to get indoor cactus to bloom?

Some of the tropical plants I brought into the house to spend the winter are dropping leaves. What’s going on?

Mulching Perennials

Is it too late to plant bulbs?

When should you use tree wrap?

Planting Mums in the Ground

Should I remove all fallen leaves from my garden beds?

When to Harvest Winter Squash

Winter Watering Tulips & Daffodils

When to Prune Hydrangea Paniculata

How to Correct a Leaning Tree

Propagating Coleus

Is September a good time to plant garlic?

Can I still plant vegetables for a fall harvest?

Fall-Blooming Perennials to Plant Now

Reseeding Perennials and Annuals – When should I stop deadheading flowers?

When to Plant Spring Bulbs - Is September Too Early?

Overwintering of Crocosmia

Is it okay to fertilize roses in August?

Why do my zucchini keep shriveling up?

What's the difference between part sun and part shade?

Shiny Mahonia Repens

Is it okay to plant flowers in with my vegetables?

Bolted Lettuce and Spinach

Long's Gardens
Since 1905

Miss Penn's
Mountain Seeds

Rocky Mt Chapter
North American Rock Garden Society

Colorado Native
Plant Society

Harlequin's Gardens
Sustainable Nursery

Eaton Grove
Nursery

Al’s Pine
Garden & Nursery

Bath Garden Center
& Nursery

High Plains
Environmental Center

The Garden Wise
Show

Conservation Gardens
at Northern Water

View our Calendar for Colorado Gardening Events!