Cooler Nights Are Coming: Preparing your Oklahoma Garden & Houseplants for fall.

If you garden in Oklahoma, you already know that fall doesn't always arrive politely.

We can have an afternoon that feels suspiciously like July followed by a nighttime temperature that has you standing on the porch thinking, Wait… do I need to bring all these plants inside tonight?

Welcome to fall gardening in Oklahoma!

The transition into cooler weather doesn't mean gardening season is over. In fact, this is one of my favorite times to reset, clean up, harvest and prepare plants for the months ahead.

A little work now can help your houseplants transition indoors successfully, protect perennial plants through winter and give your fall vegetables a longer growing season.

🌿 First: Decide Who Is Coming Inside

If your houseplants spent the summer outdoors, don't wait until the first frost warning to suddenly carry 37 pots into the living room.

Ask me how I know that's not a fun evening.

Many tropical houseplants don't appreciate cold nights, even when temperatures are well above freezing. Start watching nighttime temperatures and begin preparing plants before consistently chilly nights arrive.

But before they come inside, this is a perfect opportunity for a little plant makeover.

✂️ Trim Them Back

After a summer outside, some houseplants may have become considerably larger than they were in spring.

And while that enormous philodendron looked fantastic taking over half the patio, you may feel differently when it is taking over half the dining room.

Remove:

• Dead or damaged leaves

• Weak or unhealthy growth

• Excessively long or unruly stems

• Any diseased plant material

  
  

Depending on the plant, healthy cuttings can also be propagated rather than discarded.

The goal isn't to hack everything down simply because winter is coming. Prune according to the needs of the particular plant. But for plants that tolerate pruning well, this is an opportunity to make them healthier, cleaner and a little more manageable indoors.

🪴 Repot — But Only When Needed

This is also a good time to examine the pot and soil.

Is the plant severely rootbound? Is the soil compacted, poorly draining or harboring pests? Has the plant been in the same tired potting mix for years?

If so, repotting may be appropriate.

Use a clean container with adequate drainage and a fresh potting medium appropriate for that particular plant. You can also divide plants that have become overcrowded.

However, don't automatically move every plant into a much larger pot. A bigger pot isn't always better. Excess soil around a relatively small root system can remain wet too long and contribute to root problems.

Think refresh, not necessarily supersize.

🐛 Please Don't Bring the Neighborhood Inside

This may be the most important step.

Before a plant crosses the threshold, inspect it carefully.

Look underneath leaves, along stems, around new growth, underneath the pot and around drainage holes for signs of:

• Spider mites

• Aphids

• Mealybugs

• Scale

• Fungus gnats

• Whiteflies

• Egg masses or webbing

• And, of course, the occasional spider who apparently assumed the invitation included them

  
  

Clean the outside of containers and remove dead leaves and debris from the soil surface. If pests are present, identify and address them before introducing that plant to the rest of your indoor collection.

When possible, keep plants returning from outdoors separated from established indoor plants for a period of observation.

One tiny hitchhiker can become a whole-house problem surprisingly quickly.

☀️ Remember: Indoor Bright Light Is NOT Outdoor Bright Light

This catches a lot of plant owners by surprise.

A bright room may look wonderfully sunny to us, but light intensity inside a home is dramatically different from being outdoors.

On top of that, winter brings shorter days.

Place plants according to their individual light requirements and watch what they tell you. Plants stretching toward a window, producing weak elongated growth or losing vigor may need more light.

A grow light or other appropriate supplemental plant lighting can make a huge difference during Oklahoma's winter months.

Also remember that indoor winter conditions change more than just light.

Furnaces lower humidity, and heating vents can create very warm, dry pockets of air.

Keep plants away from direct blasts from heating vents and fireplaces, and adjust watering rather than simply continuing your summer schedule.

With less light and slower growth, many plants need less frequent watering during winter.

🌱 What About the Plants Staying Outside?

Your indoor plants aren't the only ones that need fall attention.

Now is the time to walk through perennial beds and decide what actually needs to be trimmed.

Remove diseased, broken or badly damaged growth, but don't feel obligated to make every perennial bed perfectly bare for winter. Depending on the plant, some stems and seed heads can provide winter interest and habitat.

Know the needs of the particular perennial before giving everything the same haircut.

Fall is also a good time to clean up diseased plant material and weeds that could provide overwintering areas for unwanted garden pests.

🌿 Harvest Those Herbs!

If your herb garden is still producing, don't let all of that summer work disappear with the first hard freeze.

Harvest herbs for drying, freezing or preserving.

Depending on what you're growing, you may still have:

• Rosemary

• Thyme

• Sage

• Oregano

• Mint

• Lemon balm

• Basil

• Parsley

• Other culinary or medicinal herbs

  
  

Healthy herbs can be bundled and air-dried when appropriate, dried on screens or placed in a dehydrator.

Once thoroughly dry, store herbs away from heat, moisture and direct sunlight.

And remember: some perennial herbs can remain outdoors through winter while tender herbs cannot. Basil, for example, has a very different relationship with cold weather than thyme.

🍂 Mulch — Nature's Winter Blanket

Mulch is one of the simplest tools we have for protecting soil and plant roots.

It helps moderate soil-temperature fluctuations, retain moisture and protect roots through changing weather.

That temperature moderation is especially helpful during Oklahoma's habit of bouncing between warm sunny days and freezing nights.

For established landscape perennials, timing and depth depend on what you're protecting. Avoid piling mulch directly against plant crowns, trunks or stems.

For winter protection of landscape plants, Oklahoma State University recommends applying winter mulch after a killing frost rather than piling it on too early.

🥬 Don't Give Up on the Fall Vegetable Garden Yet!

One chilly night doesn't necessarily mean the garden is finished.

Many cool-season vegetables can tolerate cooler conditions quite well, and some can continue producing after frost.

Row covers, low tunnels and cold frames can help extend the growing season by protecting crops from cold winds and frost and creating a slightly warmer environment around plants.

So get your supplies together before you need them.

Keep frost cloth, row-cover fabric, hoops or other supports somewhere easy to grab.

If you don't have commercial frost cloth, an old sheet can provide temporary protection in a pinch. Avoid resting heavy materials directly on delicate plants when possible.

And secure those covers well.

Because this is Oklahoma.

If you don't secure them, your frost blanket may be protecting somebody's tomatoes three houses down by morning.

🌡️ Watch the NIGHTTIME Temperature

One of the trickiest things about Oklahoma fall weather is the difference between daytime and nighttime temperatures.

A warm afternoon can make us forget how quickly temperatures can drop after sunset.

Don't look only at the day's high.

Start checking the overnight low regularly, especially as we move farther into fall.

That gives you time to:

✓ Bring tender containers indoors

✓ Harvest cold-sensitive herbs and vegetables

✓ Cover vulnerable crops

✓ Protect recently planted or sensitive plants

✓ Disconnect or protect garden equipment when freezing weather eventually arrives

Preparation is much easier at 4:00 in the afternoon than running through the backyard with sheets and flashlights at 10:30 at night.

Trust me on that one.

🍁 Fall Isn't the End of the Garden

I think that's one of the things I love most about gardening.

Every season asks us to do something different.

Spring says plant.

Summer says grow.

Fall says harvest, protect and prepare.

And winter gives both the garden — and the gardener — a little time to rest, plan and dream about what comes next.

So enjoy those beautiful Oklahoma fall afternoons. Harvest your herbs. Give the houseplants their annual inspection. Get your frost covers ready.

And maybe leave a little room near the windows.

Because somehow the five houseplants you carried outside in May have turned into fifteen plants that need to come back inside.

Funny how that happens.

Nurturing Health, Growing Wellness Together.

Ella-Ang Plants & Wellness