Buckeye Yard and Garden onLine

The range of GDD accumulations in Ohio from north to south is 299 to 493. Following is a report of GDD for several locations around Ohio as of May 13, 2008: Painesville, 299; Cleveland, 311; Toledo, 318; Canfield, 319; Lima, 328; Wooster, 336; Coshocton, 363; Columbus, 406; Springfield, 376; Dayton, 383; Cincinnati, 451; Ironton, 469; Portsmouth, 472; and Piketon, 493.

To put these GDD accumulations into perspective, the following is an abbreviated listing of plant and insect species with their respective phenological event and average GDD accumulations at which these events occur. Due to variations in weather, temperature, humidity, etc., these events may occur a few days earlier or later than predicted by the average GDD. By looking at a city, town, or village near you from the above list, or visiting the above web site, you can see what could be taking place in the landscape around you.

Sargent crabapple, full bloom, 298; red horsechestnut, first bloom, 304; pine needle scale, egg hatch - 1st generation, 305; cooley spruce gall adelgid, egg hatch, 308; eastern spruce gall adelgid, egg hatch, 308; common lilac, full bloom, 315; pink princess weigela, first bloom, 316; blackhaw viburnum, full bloom, 322; redosier dogwood, first bloom, 323; dwarf fothergilla, full bloom, 325; winter king hawthorn, first bloom, 328; lilac borer, adult emergence, 330; slender Deutsia, first bloom, 338; Japanese kerria, full bloom, 342; common horsechestnut, full bloom, 344; red chokeberry, full bloom, 351; doublefile viburnum, first bloom, 353; Pagoda dogwood, first bloom, 363; red Java weigela, first bloom, 365; black cherry, first bloom, 368; common sweetshrub, first bloom, 371; lesser peach tree borer, adult emergence, 372; Ohio buckeye, full bloom, 374; holly leafminer, adult emergence, 375; euonymus scale (1st generation), egg hatch, 406; Ohio pioneer thicket hawthorn, first bloom, 406; Vanhoutte spirea, full bloom, 406; winter king hawthorn, full bloom, 407; Catawba rhododendron, first bloom, 407; Tatarian honeysuckle, full bloom, 410; beautybush, first bloom, 417; black cherry, full bloom, 419; Miss Kim Manchurian lilac, first bloom, 422; white fringetree, first bloom, 435; locust leafminer, adult emergence, 437; red horsechestnut, full bloom, 440; boxwood leafminer, adult emergence, 440; doublefile viburnum, full bloom, 444; bush cinquefoil, first bloom, 444; snowmound Nippon spirea, first bloom, 445; red prince weigela, first bloom, 446; pink princess weigela, full bloom, 446; redosier dogwood, full bloom, 448; scarlet firethorn, first bloom, 459; black locust, first bloom, 467; Ohio pioneer thicket hawthorn, full bloom, 470; red buckeye, full bloom, 471; common ninebark, first bloom, 478; pagoda dogwood, full bloom, 479; umbrella magnolia, full bloom, 480; sweet mockorange, first bloom, 482; oystershell scale, egg hatch, 497; Miss Kim Manchurian lilac, full bloom, 498; and smokebush, first bloom, 501.

For more information, see:

• Growing Degree Days and Phenology for Ohio
• Understanding and Using Degree-Days