Rent Shop 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
1 rating

Sunday - June 14, 2009

From: sinking spring, PA
Region: Mid-Atlantic
Topic: Herbs/Forbs
Title: Non-blooming Hypericum in Eastern Pennsylvania
Answered by: Jackie OKeefe

QUESTION:

I purchased a St. Johnswort about 3 years ago. I has never bloomed. It is alive & well. I know this since it has started to spread shoots. Is there a trick to this one? Occasionally something I plant doesn't survive, but I have never had a plant survive & not bloom. Am I missing something?

ANSWER:

The Lady Bird Johnson Wildflower Center is dedicated to disseminating information about our native species and encouraging their use in their native habitats. Here is a link to our article on the reasons why natives make sense. Since St Johns Wort is a common name that covers many varieties, we can’t be positive about the precise species you are growing; Pennsylvania has sixteen native Hypericum (St. Johns Wort) varieties, with varying habitat and growth requirements. We can try to identify it if you send us a photo. If your plant is from a nursery it may be Hypericum ‘Hidcote’, a cultivar whose parents are of European origin and out of our area of expertise. Here is a link to a web page with background on Hypericum 'Hidcote'.

Some general causes for plants not to flower follow:

Too little sun; Hypericum can grow in shade, but flowers better in sunnier locations.

A variety not well-suited to your area; nurseries often get stock from far-away suppliers in different climates.

Improper fertilization; high nitrogen fertilizers can promote green over flowering growth.

Pruning at the wrong time; probably not the problem here, but some plants bloom on new growth, others on previous seasons' growth.

 

More Herbs/Forbs Questions

Salt-tolerant plants in Central Texas
September 16, 2009 - Do you have any suggestions for salt-tolerant plants in Central Texas? Thanks.
view the full question and answer

When to Collect Rudbeckia triloba Seed?
September 13, 2014 - How soon after flowering may I cut Rudbeckia triloba flower heads to save seeds? Do cones need to be attached to the plant in or out of the ground to continue to mature?
view the full question and answer

Cutting Garden Plants for TN
July 16, 2014 - I would like to know what would be in a year round cutting garden in Nashville, TN for a novel I am writing.
view the full question and answer

Are there drug cartels on the bluebonnet trails from Lake City FL
February 08, 2012 - We plan to fly to TX to see bluebonnets but do not know if the weather and forest fires have destroyed them. If not, can you estimate the peak bloom time? We are 75 and 81 and move around rather s...
view the full question and answer

Gregg's Mistflower stressed in Fredericksburg TX
August 07, 2013 - My Gregg's Mist Flower plants are very stressed. The blooms have turned brown and the leaves are drooping. Plants are receiving moderate sun, partial shade. Do they need daily watering this time o...
view the full question and answer

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