Cooperative extension offices

Ohio State University Extension Ask Extension

Columbus, Ohio, serving Ohio. Listed as a reference, not an endorsement.

Overview

OSU Extension Ask Extension accepts gardening questions and connects Ohio residents with research-based answers from faculty, staff, and Master Gardener volunteers. This listing is provided for reference, not as an endorsement, certification, ranking, or guarantee of current availability.

Services and programs

  • Online garden questions
  • Plant clinics
  • County extension links

What to verify before you go

Contact the organization or review its official source before making a trip, placing an order, joining a garden, or applying for funding. Details that commonly change include:

  • Current question submission process
  • County-specific contacts
  • Response timing

Related directory resources

Browse all extension offices or return to the directory hub.

Sources and last verified

Source: Ohio State University Extension. Last checked 2026-10-04.

OSU Extension Ask Extension accepts gardening questions and connects Ohio residents with research-based answers.

What this listing covers

Questions may be answered by OSU Extension faculty, staff, or Master Gardener volunteers. The source also links to county offices for county-specific issues.

Before submitting

Include useful details and photos when appropriate. For local regulations or services, contact the relevant county office directly.

More tools

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Calculate

Plant spacing calculator

Find how many plants fit in your garden.

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Calculate

Watering calculator

Convert weekly water depth into gallons and runtime.

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Calculate

Rain barrel calculator

Size rain barrels from roof area and rainfall.

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Calculate

Drip irrigation calculator

Turn emitter flow rates into weekly drip runtime.

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Garden guides

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Greenhouse growing

Greenhouse temperature guide for seeds and seedlings

Use crop-specific greenhouse temperatures for seed germination, seedlings, frost protection, and ventilation, with practical day and night ranges.

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Diagram of a raised bed cross section showing timber walls, a layer of existing soil or coarse fill, and the measured depth of new soil being added.

Materials

How much soil does a raised bed need?

How to measure a raised bed and turn the volume into bags or bulk cubic yards, with a worked example for a common 8 by 4 bed.

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October calendar diagram showing planting windows for garlic, spring bulbs, hardy greens, and cover crops closing as the first fall frost approaches.

Seasonal

What can I plant right now in my garden?

In early October, most US gardeners can still plant garlic, spring bulbs, hardy greens, and cover crops. Here is what is still open and what has closed.

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Diagram of a tulip bulb in a soil cross section planted at about three times its own height, pointed end up, with a depth marker of 6 to 8 inches.

Fall planting

When should I plant tulip bulbs?

Plant tulip bulbs in fall, about 6 to 8 weeks before the ground freezes. Here is how the window shifts by region and how deep to plant.

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Plant library

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Illustration of a lovage plant with large divided leaves

Herb

Lovage

A towering hardy perennial with a concentrated celery flavor in its leaves, stems, and seeds.

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Illustration of chamomile stems with small white daisy flowers

Herb

Chamomile

A cool-season annual whose small daisy flowers dry into the classic tea herb.

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Illustration of a lemon verbena stem with narrow pointed leaves

Herb

Lemon verbena

A tender shrub with intensely lemon-scented leaves, grown in containers where winters freeze.

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Illustration of a sorrel plant with spear shaped leaves

Herb

Sorrel

A hardy perennial with lemony leaves, among the first greens ready in early spring.

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Glossary terms

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soil

Organic matter

Organic matter is material derived from living organisms at different stages of decomposition. It influences soil structure, water, nutrients, and biological activity.

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plant labels

Organic

Organic can describe a certified production system that follows defined rules, or materials derived from living organisms. The context matters.

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plant labels

Perennial

A perennial is a plant that can live and grow for multiple years, although its top growth may die back seasonally. Learn what the label does and does not promise.

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plant biology

Photoperiod

Photoperiod is the pattern of light and darkness a plant experiences each day. It can influence flowering, dormancy, and seasonal growth in some species.

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Gardening directories

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Nurseries and garden centers

North Creek Nurseries

North Creek Nurseries is a wholesale propagation nursery specializing in perennials, ornamental grasses, ferns, and Eastern United States native plants.

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Nurseries and garden centers

Plant Delights Nursery

Plant Delights Nursery offers perennial plants, including rare and native selections, through its online catalog and scheduled open nursery weekends.

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Seed companies

Territorial Seed

Territorial Seed publishes spring and fall catalogs with vegetable, flower, heirloom, and organic seed selections and planting advice.

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Seed companies

Fedco Seeds

Fedco Seeds publishes seed, plant, tree, shrub, and supply catalogs with organic, heirloom, and cold-hardy selections.

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