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

Saturday - July 27, 2013

From: San Diego, CA
Region: California
Topic: Propagation, Seeds and Seeding, Shrubs
Title: Weak flowering on rosa minutifolia from San Diego CA
Answered by: Barbara Medford

QUESTION:

Hi, I have a Rosa minutifolia and has been doing great, but when it gives flowers the petals fall too fast, only last a day or two and also the fruit never forms completely and finishes drying so I can't get seeds. What can I do? The plant receives indirect light the most of the day, and 3 hours of direct light approximately. It is not under typical water-stress of the summer, I water it regularly to keep it out of dormancy. Thanks for the advice

ANSWER:

From Calflora, here is Taxon Information on Rosa minutifolia. According to this USDA Plant Profile Map, it is native only to San Diego County in North America. Although the USDA is our source for material in our Native Plant Database, the map is all we can find in the USDA database, no information on whether it is native or introduced, etc. So, we have nothing in our database on it. We do know from the Taxon Information (above) that it is considered endangered, but not whether it is officially classified as native to North America. The best information we found on the plant was in the Las Pilitas Nursery website.

From the Las Pilitas Home Page:

"Since the 1970's Las Pilitas Nursery has been combining research and California native plants. We do the work, you get to play with the plants and enjoy the resulting web pages."

So, we will accept their word that this is a native plant to North America, but so far we still have found no information on growing conditions that might give us a clue to the answer to your question. The California Coastal Rose Society has a long article on it, but it infers more that the plant is disappearing altogether than that it has trouble retaining  blooms long enough to seed.

From helpmefind.com on 'Rosa minutifolia Englemann':

"USDA zone 9b and warmer.  Can be used for specimen.  Benefits from winter protection in colder climates.  drought resistant.  prefers dry climates.  prefers full sun.  prefers warmer sites.  Do not prune."

Perhaps it is getting too much water and not enough sun, both of which can inhibit blooming in a rosa genus. Be sure and not sprinkle the leaves to water, as this is conducive to mildew, which could also be causing petal drop.

 

 

More Seeds and Seeding Questions

Propagation of Chandler's craglily from San Marcos TX
December 16, 2012 - Can you please advise me on collecting and propagating seed from Chandlerís craglily -Echeandia chandleri. I have 2 plants that came from the wildflower center. They never seem to multiply, but they d...
view the full question and answer

Number of seeds per pound for Curvepod fumewort from Bridger MT
June 17, 2010 - Do you know or where can I find the number of seeds per pound for Corydalis curvisiliqua-scrambled eggs?
view the full question and answer

Ground cover for steep slope in Washington DC
May 07, 2010 - We have a steep slope in our garden in Washington DC which has sun from noon to sun set. Could you please recommend some low maintenance plants which would be a good ground cover and limit erosion?
view the full question and answer

Can poisonous seed of wild plum be safely removed after steaming from Seymour IA
June 20, 2013 - I read on a related questions that you said the pit/seeds of all wild plums are poisonous. My question is this, can I juice the entire fruit for making jelly without removing the pit first? I have a s...
view the full question and answer

Finding a source of Straggler daisy
October 14, 2015 - I've decided on Straggler daisy but am having trouble finding it. It would be perfect for me. Do I have to wait until next Spring for it to show up? Can it be ordered through a nursery or a landscape...
view the full question and answer

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