Contact Us Host an Event Volunteer Join

Q. Who is Mr. Smarty Plants?

A: There are those who suspect Wildflower Center volunteers are the culpable and capable culprits. Yet, others think staff members play some, albeit small, role. You can torture us with your plant questions, but we will never reveal the Green Guru's secret identity.

Help us grow by giving to the Plant Database Fund or by becoming a member

Did you know you can access the Native Plant Information Network with your web-enabled smartphone?

Share

Ask Mr. Smarty Plants

Ask Mr. Smarty Plants is a free service provided by the staff and volunteers at the Lady Bird Johnson Wildflower Center.

Search Smarty Plants
See a list of all Smarty Plants questions

Please forgive us, but Mr. Smarty Plants has been overwhelmed by a flood of mail and must take a break for awhile to catch up. We hope to be accepting new questions again soon. Thank you!

Need help with plant identification, visit the plant identification page.

 
rate this answer
Not Yet Rated

Sunday - April 10, 2016

From: Boerne, TX
Region: Southwest
Topic: Problem Plants, Shade Tolerant, Trees
Title: Why doesn't my Rusty blackhead bloom?
Answered by: Guy Thompson

QUESTION:

I have planted Rusty blackhaws the past several years..some bloomed the first year and every year since....and others 3 years old have not bloomed yet... Do all Rusty blackhaws bloom eventually or are there male plants that do not bloom..??

ANSWER:

One of our previous answers addresses this question. 

"According to the chart in Tree Sex: Gender & Reproductive Strategies from Warnell School of Forestry and Natural Resources, The University of Georgia, Viburnum rufidulum (Rusty blackhaw viburnum) is neither monoecious (male and female reproductive structures on the same plant but in separate flowers) or dioecious (male and female reproductive structures on separate plants).  It is cosexual or hermaphroditic (male and female structures together in the same flower)."

Therefore, all plants have the capability of blooming.  I have read that while Rusty blackhaw thrives as a small understory tree it blooms most prolifically in full sun.  It makes me wonder if your trees that have not yet bloomed are in a more heavily shaded location than your blooming trees.  That is the only reason I can think of unless the plants are simply not yet old enough to bloom.

 

 

 

 

More Trees Questions

Native species of tree for Rockwall TX
March 19, 2014 - Hello, I am attempting to plant a native species of tree 20 miles east of Dallas, Texas (Rockwall, TX) in honor of my brother's marriage. He is a biologist and a huge supporter of native species....
view the full question and answer

Wind damage to pecan tree in Royse City, TX
June 14, 2009 - The wind broke my pecan tree trunk in two. It is approximately 2 in caliper and about 15 feet tall. Is there a tree trunk repair?
view the full question and answer

Freeze damage to Mexican olive in Austin
December 13, 2009 - I have a Mexican Olive tree/bush. It is young - about 8 ft. tall. This last freeze in Austin made many of its leaves turn black. I got this from your database: "Its native range extends no farther...
view the full question and answer

Eliminating black locust volunteers in Rockville MD
September 27, 2011 - I am a landscape designer whose client has a very large, mature black locust in her front yard. Not surprisingly, she also has multitudes of black locust volunteers popping up all over her yard. The...
view the full question and answer

Late planting plum tree from Lago Vista, TX
May 01, 2014 - I have two plum trees in plastic containers that I purchased in March. For a lot of reasons, we didn't get them planted. I have kept them alive by watering consistently, but I am now wondering what...
view the full question and answer

Support the Wildflower Center by Donating Online or Becoming a Member today.