Original article written by By Trisha Gedon – Oklahoma State University Extension

– Greenhouses are designed to nurture and protect plants, not to serve as makeshift storage sheds. While it may be tempting to keep all your gardening tools and supplies within reach, experts from Oklahoma State University Extension warn that improper greenhouse storage can harm both your equipment and your plants.

The Risks of Storing Tools in Your Greenhouse

“Greenhouses are humid environments, which makes them unsuitable for storing many gardening-related items,” says David Hillock, OSU Extension consumer horticulturist.

Metal tools stored in a greenhouse can quickly rust, while wooden handles are prone to splitting in high humidity. If you must keep tools nearby, opt for stainless steel or plastic-handled tools, and store others in a dry, ventilated area.

Don’t Let Diseased Plants Linger

According to Casey Hentges, OSU Extension associate specialist and host of Oklahoma Gardening, diseased plants should never remain in a greenhouse.

“Greenhouses create the perfect conditions for plant diseases and pests to thrive and spread,” Hentges explains. “Remove unhealthy plants immediately and always inspect new ones before bringing them inside.”

Keep Pesticides Out of the Greenhouse

Storing pesticides in your greenhouse is not only dangerous—it’s ineffective. Most pesticides require storage temperatures between 40°F and 90°F. Exposure to extreme heat or cold, both common in Oklahoma, can degrade the chemicals or even pose a fire risk. Instead, store pesticides in a cool, dark, and well-ventilated space.

Why Seeds and Cardboard Don’t Belong

Humidity is the enemy of packaged seeds and cardboard plant trays, which are highly absorbent and prone to mold. Accidental water spills can also destroy your seed stock. Store seeds in cool, moisture-free conditions for maximum longevity.

Additionally, cardboard attracts rodents, who may chew on it and eat your seeds. Rather than risking a mess, use cardboard outdoors in your garden as weed barriers or compost it for sustainable use.

Avoid Heat Damage to Electrical Equipment

As summer temperatures rise, so will the heat inside your greenhouse. Any electrical devices that aren’t designed to withstand extreme temperatures should be removed.

Use Your Greenhouse for Its True Purpose

“A greenhouse should be reserved for what it does best—growing and nurturing healthy plants,” Hillock concludes.

By maintaining your greenhouse properly and avoiding clutter, you’ll ensure a healthier growing environment and extend the life of your tools and supplies.

About OSU Extension:

The Oklahoma State University Extension provides research-based, practical information to all 77 counties in Oklahoma. Most resources are available at little or no cost to help residents improve gardening practices, manage resources, and strengthen communities.

MEDIA CONTACT:
Trisha Gedon
Office of Communications & Marketing, OSU Agriculture
📞 405-744-3625
✉️ trisha.gedon@okstate.edu