Although bloom times are directly related to the weather, the chart below displays the usual times for the listed plants to bloom in Boerner Botanical Gardens.

What's in Bloom?


Since 2007, Master Gardener Volunteers working with the UW-Extension Horticulture Center at Boerner Botanical Gardens have been recording blooms in the Perennial Garden. 

Master GardenersTo see detailed records for more than 2,000 perennial plants, please select from the following:

2019 Blooms In the Garden Report – Excel

2018 Blooms In the Garden Report – Excel

2018 Blooms in the Garden

2017 Blooms in the Garden

2016 Blooms in the Garden


Perennial Map

Rose Garden Map

Rock Garden Map

Tree and shrub collection information is available upon request.
Please call (414) 525-5601.


Plant Heath Advising Program

Plant Health Advising Help Desk
Lawn & Garden Questions?
Serving Kenosha, Milwaukee & Racine Counties

Get your lawn & garden questions answered by our WI Master Gardener Volunteers serving at the Plant Health Advising (PHA) Offices in Kenosha, Milwaukee and Racine Counties in Wisconsin.


Plant diagnosis, plant disease testing*, garden related insect identification, soil testing*, landscape & gardening info, and plant identification.
*- cost associated for testing, call/email for more info.
Call: 608-298-6945 ( April – October, Monday to Saturday, 10.00 A.M. – 4.00 P.M.)
Email: [email protected]
Walk-in Diagnosis PHA Locations (Hours vary by location, call or email prior to visit):
• Kenosha County: Extension Kenosha County, Kenosha County Center, 19600-75th Street, Suite 2, Bristol, WI 53104
• Milwaukee County: Boerner Botanical Garden, 9400 Boerner Drive, Hales Corners, WI 53130
• Racine County: Racine County Ives Grove Offices 14200 Washington Avenue Sturtevant, WI 53177
Plant & insect sample Drop Box:
Located in front counter at the PHA offices in Kenosha, Milwaukee and Racine County. Opening and closing hours at each location varies; call or email prior to visit.