En EspaŅol

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?


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
Can't find the answer in our existing FAQs, submit a question to Mr. Smarty Plants.
Need help with plant identification, visit the plant identification page.
rate this answer
Not Yet Rated

Wednesday - June 13, 2007

From: Pascagoula, MS
Region: Southeast
Topic: Cacti and Succulents
Title: Crown rot in Agave americana
Answered by: Nan Hampton


My Century Plant's leaves get soft toward the base and eventually fall over and I have to cut them off. What causes this?


It sounds as if your Agave americana (American century plant) has crown rot, probably from overwatering and/or inadequate drainage. The rot itself is caused by bacteria or fungus that enter the plants through wounds. In the desert bacteria may be introduced by weevils but that may or may not be the case for your plant in Mississippi. You should check the plant carefully for the agave weevil (it looks a lot like a boll weevil). If you find them, you should remove them and you might consider treating the plant with an environmentally-friendly pesticide. Most likely, yours is a fungal infection from overwatering and poor drainage. In that case, reduce your watering significantly and treat with an environmentally-friendly fungicide and hope for the best. You can read more about care for Agave.


From the Image Gallery

American century plant
Agave americana

More Cacti and Succulents Questions

Native plants of Taos and Los Alamos NM from Houston
April 07, 2012 - Hi, Mr. Smarty Plants, can you recommend a guidebook for the native plants of the Taos/Los Alamos region? (I'm most interested in forbs.) I'll be headed there in May--is there anything I should es...
view the full question and answer

Should I remove the flowering stalk from my Dasylirion leioiphyllum?
March 23, 2009 - We transplanted a plant that is new to us but going through your photos on your website, it appears that we have a Dasylirion Leiophy. My question is this.. Are we supposed to cut the 6' stem that f...
view the full question and answer

Failure to bloom of red yucca from Lago Vista TX
April 09, 2013 - I am in Lago Vista - trying to find out why I can't get my red yucca to bloom. The first year they were great and now after two or three years - no measurable spikes have shown up. HELP!
view the full question and answer

Smog-eating plants from Ft. Worth TX
September 30, 2012 - Looking for a list (40 >) of Native Texas Plants for Fort Worth Urban (Condo) that are Drought tolerant or (drip irr) and Fragrant and long blooming and eat up the city smog. Fort Worth is in a non-at...
view the full question and answer

Replacement for Spanish Dagger from Georgetown TX
June 22, 2011 - I have a Spanish Dagger plant in my garden which appears to be dying. Where can I purchase a replacement for this plant? The Spanish Dagger I have is close to 10 feet tall. What is the best way t...
view the full question and answer

Smarty Plants's Facebook profile Support the Wildflower Center by Donating Online or Becoming a Member today.

Mr. Smarty Plants wants you to be his Facebook friend. Click the Facebook icon to add yourself to Mr. Smarty Plants list of friends.
© 2015 Lady Bird Johnson Wildflower Center