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
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?
My Spring Bulbs are Emerging. Will frost or snow hurt and cause damage?
Evergreen that Everyone will Envy.
Spotted Lanternfly Walk-About for Green Industry Professionals
Time to Tap Maples.
Scouting for Scale in Winter
Crimes against Trees.
Spotted Lanternfly Field Trip trains attendees to “SPOT” egg masses
Right Plant, Right Place.
The Ball Drops on Callery Pear in 2023!
OK to prune OAKS. Now’s the time to schedule!
Buying a Live Christmas Tree this year! What to do before I put it in the stand?
Christmas! Trees! Too Early?? Not if you are a grower! Or an Early shopper!
Where has all the fall color gone?
Should I stake my trees for Winter? It depends…...
Buckeyes……………..Don’t Pass the Buck!
Spotted Lanternfy - If You Detect It, Collect It!