The Northern Nevada Fall Garden Cleanup: What to Cut, Leave & Protect

The first day of fall in Northern Nevada can make gardeners want to reach for the pruners.

Flowers fade, leaves turn brown and perennials that were beautiful a few weeks ago suddenly look rough around the edges. But before you cut everything to the ground and haul it away, take another look.

Autumn garden cleanup in Northern Nevada isn't about making every bed perfectly tidy. Some plants benefit from being cut back, some are better left standing through winter, and others need a little protection before our dry high-desert winter weather arrives.

Knowing the difference can mean healthier plants in spring—and a garden that continues supporting birds, pollinators and other wildlife long after the flowers have faded.

What Should You Cut Back in Fall?

Start with the things that can actually cause problems if they're left behind.

Remove Diseased or Damaged Plant Material

Foliage showing signs of disease should generally be removed rather than leaving it to over winter. The same goes for badly damaged or pest-infested plant material.

Don't automatically toss diseased material into your home compost pile, either. Depending on the disease and your composting conditions, pathogens may survive and find their way back into the garden next year.

Hollyhocks: Clean Up Diseased Foliage

Hollyhocks are a good example of a plant that may benefit from some fall cleanup. They are particularly susceptible to hollyhock rust, which causes yellow, orange or brown spots and pustules on the leaves. If your hollyhocks show signs of rust, remove affected foliage and fallen leaves before winter.

Healthy seed heads are another matter. If disease isn't an issue and you'd like your hollyhocks to reseed, leave some in place.

Hostas: Wait for Frost

There's no need to rush out and cut down healthy hosta foliage while it's still doing its job. Once a hard frost has caused the leaves to yellow, collapse and turn mushy, however, they can be removed. Cleaning up that deteriorating foliage eliminates some of the damp hiding places favored by slugs and snails.

What Should You Leave Standing Until Spring?

Here's where fall cleanup gets a little less tidy—and a lot more interesting. Spent flowers, seed heads and standing stems aren't necessarily garden waste. They can continue playing a role in the garden throughout fall and winter.

Coreopsis: Leave the Seed Heads

When Coreopsis finishes blooming, consider leaving healthy stems and seed heads standing. The seeds can provide food for birds, while the standing plants add structure to an otherwise dormant winter garden. You can do the larger cleanup when new growth begins in spring.

Penstemon: Let It Stand

Penstemons are another good candidate for a lighter fall touch. Rather than cutting healthy plants all the way back in autumn, leave stems and seed heads standing through winter and save the primary cleanup for spring.

Those stems and the surrounding undisturbed plant material contribute to the varied habitat beneficial insects use for nesting and overwintering.

Rudbeckia: The Flowers Are Gone, but their Job Isn't Finished

Black-eyed Susans (Rudbeckia) may look finished once their bright petals disappear, but those dark centers become seed heads. Leaving them standing provides food for birds during fall and winter. Any remaining late-season flowers can also continue serving visiting pollinators.

This is one of our favorite examples of why brown doesn't automatically mean useless in a fall garden.

Don't Forget the Leaves

Fallen leaves don't always need to go into a bag. Leaf litter can provide valuable habitat for insects and other small creatures during winter. Where practical, consider leaving leaves in place or moving them from lawns and walkways into garden beds and around trees and shrubs instead of removing them from the landscape entirely.

A layer of leaves can also help insulate the soil and protect the organisms living beneath it.

This is one area where we love the guidance from the Xerces Society's “Leave the Leaves” initiative, which encourages gardeners to rethink the perfectly clean landscape and preserve more nesting and overwintering habitat.

Learn more from the Xerces Society:
https://www.xerces.org/blog/leave-the-leaves

Leave a Little Bare Ground, Too

This one surprises a lot of gardeners: not every inch of exposed soil needs to disappear under mulch, rock or landscape fabric.

Many native bees nest in the ground and need access to bare, relatively undisturbed soil. Leaving small areas available can provide habitat that an immaculate, completely covered landscape cannot.

That doesn't mean leaving your entire yard bare. Think of it as another habitat feature.

What About Plants You Don't Want Spreading?

Wildlife-friendly gardening doesn't mean allowing every plant to scatter seed wherever it wants.

Centranthus: Decide Before It Goes to Seed

Centranthus, commonly called red valerian or Jupiter's beard, can reseed readily.

If you want to limit its spread, remove spent flowers and developing seed heads before the seeds disperse. If reseeding isn't a concern in your garden, leave the stems standing.

Fall cleanup isn't an all-or-nothing decision. How you manage a plant can depend on what you want it to do next year.

What Should You Protect Before Winter?

Fall garden care isn't just about pruning. In Northern Nevada, some of the most important work happens below ground.

Keep Watering New Plantings

Cooler temperatures don't mean your plants no longer need water. Trees, shrubs and perennials planted this year are still developing root systems and shouldn't enter winter severely dry. Established plants can also need supplemental water during our dry fall weather.

We've covered this in more detail in our Fall Watering in Northern Nevada guide, including when to reduce watering and when it's finally time to shut down irrigation.

Read our Fall Watering Guide → https://admin.shopify.com/store/jpc1a2-57/content/articles/694788063521

Be Careful With Lavender

Lavender doesn't need a dramatic haircut just because fall has arrived.  Avoid too much fall pruning, particularly cutting deeply into old woody growth. Heavy pruning can encourage vulnerable growth at the wrong time and leave plants less prepared for winter.

Save major shaping and pruning decisions for the appropriate time in spring, once you can see how the plant came through winter.

Northern Nevada Fall Cleanup: A Simple Rule to Remember

When you're standing in the garden wondering whether something should stay or go, ask yourself:

Is it causing a problem—or does it still have a job to do?

Remove diseased material. Clean up plants that can harbor problems. Control seed heads, sometimes by cutting them and placing them elsewhere to feed wildlife, when you don't want a plant spreading.

But healthy stems, seed heads, leaves and even a little bare ground can continue contributing to your garden ecosystem throughout the colder months. A Northern Nevada garden doesn't need to be spotless before winter. Sometimes the best fall garden cleanup is knowing what not to clean up.