Gardening Information Links

"Buckeye Yard and Garden OnLine" provides timely information about Ohio growing conditions, pest, disease, and cultural problems.

Plant Facts - OSU


You will be flooded with pop-up ads and Google Ads on this website but you will find many pages of good, time-tested  information. And remember the information is free They must pay for this website somehow.

Growing Degree Days

Hardiness Zones

Bonnie Plants



A great site for information on all types of plants! Bonnie Plants is a wholesaler of all types of garden plants that are available from many retail outlets.


This website is loaded with information about growing tomatoes There are many Amazon and Google ads on this site, but I do not any ads that are not family friendly. I feel safe in suggesting this website .

Tomato Dirt



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Growing Degree Days - Hardiness Zones

Growing Degree Days are a measurement of the growth and development of plants and insects during the growing season. Development does not occur at this time unless the temperature is above a minimum threshold value (base temperature). The base temperature varies for different organisms.  It is determined through research and experimentation.  The actual temperature experienced by an organism is influenced by several factors.  These factors affect growth and development.  For instance, depending on the weather, an organism's temperature may be a few degrees more or less than that recorded. An organism may spend its time in the shade or under direct sunlight. The fertility and nutrient content of the soil directly affect the growth rate of insects and plants.  The presence of weeds and precipitation may indirectly influence development. Due to these factors and some other scientific considerations, a base temperature of 50 degrees Fahrenheit is considered acceptable for all plants and insects.

OARDC Ohio Growing Degree Days Calculator

Hardiness Zones

USDA Plant Hardiness Zone Map

An Interactive map

Ohio Zones


5a    -15 to -20


5b    -10 to -15


6a    -5   to - 10


6b      0  to  -5