Thomas deHaas

Agriculture Natural Resource Educator
OSU Extension Educator - Lake County, Ohio

Tom "bowtie" deHaas is new to extension but known for punny, not necessarily funny treatment of all topics. 

ie. How can identify a dogwood tree? its BARK!

Agriculture experiences include teaching Vocational Horticulture, Ornamental Horticulture Nursery inventory, Design/Build Landscape Contractor, and Elementary, Middle and High School teacher.


Thomas deHaas
OSU Extension - Lake County Agriculture/Natural Resource Educator
99 East Erie Street
Painesville, Ohio 44077

Articles Authored

Title Category Published on
OGIA concludes the last Walk-about of the Season for 2023
Visiting Angels enjoy Walk-about at Miller Nature Preserve
Spotted Lanternfly found in Erie County
Spotted Lanternfly. THEY DON’T BITE!
Is my Evergreen Dead? Can I save it?
What the ‘HAIL’ happened to my tree?
Rainwater Mitigation – Is it effective?
Why do Trees Bleed?
Christmas in July!
Spotted Lanternfly 4th instar nymphs present at St Joseph Cemetery (Cleveland).
What’s happening to the plants under power lines?
Ohio Green Industry Association Hosts Walk-about at Schedel Arboretum and Gardens.
Cedar Point Thrills! Not just Roller Coasters.
Blue Spruce showing sign of the ‘Blues', top to bottom!
More abuse of Trees……………………….You’re Killin’ me Smalls!
Rain! Finally! Never so happy to see it!
I Spy……………………….Poison Hemlock.
Naked Sycamores! Are they OK?
Sawfly Strip Scots Pine.
Hemlock Woolly Adelgid(HWA) and Elongate Scale(EHL) – A 2023 update
No Mow May in Full Swing………So what’s wrong with ‘No Mow May’?
It’s the Most Wonderful Time of the Year……If you love Spring Flowering Plants!
My Evergreen that was Dead, is coming back to life! Maybe because it’s NOT an Evergreen!
Two trees in one? What’s going on? One word….Reversion.
Flowering Ornamental Pear. How invasive is it Really?
More Crimes Against Trees
Spring has arrived. Will the Spring snows hurt my plants? It All Depends on Where You Stand! Literally!
Pruning Oaks? Time may be running out!
Spring must be near. Cornelian Cherry Dogwood is beginning to bloom in Northern Ohio.
No Grapes last year on my Concords. What should I do?