When you move your tropical plants back inside for winter you don’t want to bring any unwanted pests along with them.   A few smart steps – timed right and done carefully – will keep aphids, spiders mites, whiteflies, and other hitchhikers from settling into your indoor garden.  Planning ahead will ensure your plants come in clean, healthy, and ready for the season ahead.

Best Time to Move Plants Indoors

Late summer to early fall is the sweet spot — September to early October. As temperatures dip to 10–16°C (50–60°F) , pests slow down, making them easier to spot and remove. Don’t wait for frost; cold‑stressed plants attract more pests and are harder to clean.

Before you move anything:

• Inspect leaves — especially the undersides — for aphids, spider mites, whiteflies, or sticky residue.
• Check stems and soil for scale or mealybugs.
• Shake the plant over a sheet of white paper to reveal tiny moving specks.
• Use a magnifying glass to catch anything hiding in crevices.

Taking your time here prevents headaches later.

 How to Remove Bugs Before Bringing Plants Inside

If you spot pests, act quickly and thoroughly.

• Hose rinse: Spray the plant outdoors, focusing on leaf undersides and tight stem angles. This knocks off mites, aphids, and other soft‑bodied pests.
• Alcohol swab: Dab stubborn scale or mealybugs with a cotton swab dipped in rubbing alcohol.
• Hand removal: Pick off caterpillars or larger insects. Remove leaves with eggs or larvae and toss them in the trash.
• Tool hygiene: Clean pruners between plants to avoid spreading pests or disease.
• Insecticidal Spray: Spray plants thoroughly.  Repeat treatment every other day for one week.  You can prepare your own spray or buy a commercial product such as Safer’s End All

Check the plant daily for a week. Catching stragglers now prevents indoor infestations.

Homemade Insecticidal Spray

A simple, inexpensive spray helps finish the job.

Mix in a spray bottle:

• 1 tablespoon mild dish soap
• 1 liter/quart water

Spray the entire plant — leaves, stems, and the top layer of soil. Let it sit for 10 minutes, then rinse with clean water. Repeat every few days for a week.

Don’t forget the soil

Pests hide in the top inch of potting mix. Scrape it off and replace with fresh soil.

If pests were present in the soil, clean the pot:

• Scrub with warm, soapy water
• Soak in a 1:10 bleach solution for 10 minutes
• Rinse and dry before repotting

This step ensures no hidden eggs or larvae make the trip indoors.

You can also lightly sprinkle diatomaceous earth on top of dry soil, ensuring even coverage around the base of the plant.  Wear a mask and goggles when handling DE to avoid inhaling fine dust.

Even after cleaning, keep plants separate for 2–4 weeks.

Place them in a spare room, bathroom, or garage at 16–21°C, (60–70°F).

Check daily for:

• Yellowing leaves
• Sticky residue
• Webbing
• Tiny moving dots

If pests appear, treat again with insecticidal soap. Keeping plants isolated prevents a single missed bug from spreading through your indoor collection.

 A Smooth, Bug‑Free Transition

Bringing outdoor plants inside doesn’t have to be stressful. With good timing, careful inspection, and a few simple cleaning steps, your plants stay healthy — and your home stays pest‑free. A little preparation now means a thriving indoor garden all winter long.