En EspaÑol
Share

Ask Mr. Smarty Plants

Mr. Smarty Plants - Cactus failing to thrive in New York City

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

Friday - November 21, 2008

From: NEW YORK, NY
Region: Northeast
Topic: Cacti and Succulents
Title: Cactus failing to thrive in New York City
Answered by: Barbara Medford

QUESTION:

My cactus seems to be either weak or dying. Its long stems are bending and softer than the rest. What is happening to it?

ANSWER:

Unfortunately, "cactus" is much too wide a term for an accurate answer. You didn't say if your cactus was a house plant or growing outside. In New York, that, alone could answer the question. If it's outside, it probably can't survive the cold temperatures. Because of the heat generated by a large city, New York City has warmer zones than the rest of the state, but you are still in Zone 6a to 6b, which indicates a minimum average freezing temperature of -10 to -5 or -5 to 0 deg. F. Cacti, generally, are desert plants, and don't tolerate very low temperatures. On the other hand, if your plant is indoors and not getting lots of sunlight, it doesn't tolerate that well, either, for the same reason. It is way out of its native habitat. And if it is in a pot without adequate drainage, and/or you are watering it too much, it is probably suffering from that.

Just to demonstrate our point, see this Eduscapes website on Cactus  (Cactaceae).There you will see a number of pictures showing the variety of plants in that family. It further states that there are over 2,000 species that fall in that category.

Three of the genus members of the Cactaceae family:

Mammillaria Sample North American native: Mammillaria pottsii (rat-tail nipple cactus)

Opuntia Sample North American native: Opuntia engelmannii (cactus apple).

Melocactus  According to this USDA Plant Profile, this plant is native to Puerto Rico and the Virgin Islands, but not to continental North America, so it does not appear in our database.

Many plants not even closely related are mistakenly called cactus. We have listed some of these, with native examples and links to pictures.

Yucca Yucca faxoniana (Eve's needle)

Sotol Dasylirion leiophyllum (green sotol)

Nolina Nolina lindheimeriana (devil's shoestring)

Dudleya Dudleya cymosa (canyon liveforever)

Echeveria Echeveria strictiflora (desert savior)

Graptopetalum According to the USDA Plant Profile, this plant is native to Arizona and Texas, but does not appear in our Native Plant Database.

Ocotillo Fouquieria splendens (ocotillo)

So, we hope you understand why we probably can't diagnose your plant's problem, beyond the very broad range of temperature and light exposure.  If you have it indoors, and think the lack of drainage and sunlight might be the problem, we would suggest you repot it in a pot with cactus mixture potting soil (more sand, better-draining), very good drainage, and move it to a sunny window. Beyond that, you can try looking at all the pictures we have linked you to, and if you find one you think is your plant, Google on that plant's scientific name for information on it. 

 

From the Image Gallery


Rat-tail nipple cactus
Mammillaria pottsii

Cactus apple
Opuntia engelmannii

Eve's needle
Yucca faxoniana

Green sotol
Dasylirion leiophyllum

Devil's shoestring
Nolina lindheimeriana

Canyon live-forever
Dudleya cymosa

Desert savior
Echeveria strictiflora

Ocotillo
Fouquieria splendens

More Cacti and Succulents Questions

Plants for 100 gal. pot by pool from Ft. Worth TX
June 23, 2012 - What North Texas evergreen — or combination of evergreen plants, bushes or trees — could thrive in a huge, 100-gallon clay pot (immovable!) that is situated in full sun year round in an exposed area n...
view the full question and answer

Plants for 16th floor of condo in Panama City Beach, FL
May 30, 2012 - My husband and I have a COSI on the west end of Panama City Beach, Fl. I love plants and flowers and live out of state. Our condo is on the 16th floor and directly on the gulf. What type of plants ...
view the full question and answer

Blue agave with freeze damage in Lockhart TX
March 16, 2011 - I recently planted a blue agave plant, and 4 days after I planted it the temperature dropped to 20 degrees at night. The plants are still alive but 75% of the outer limbs turned brown. What do I do wi...
view the full question and answer

Topmost leaves on yucca are brown
June 08, 2009 - I live in the Lansing, Michigan area, in the lower peninsula and have a couple yuccas whose topmost leaves are brown emerging from winter. Do I prune those, or has the plant died? Thank you.
view the full question and answer

Texas natives to plant in July and August
July 23, 2008 - My husband and I have a disaster of a lawn that we were planning to develop slowly, over time, with a sustainable design we contracted from a landscape designer. However, we are having to move out of...
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.
E-NEWSLETTER | BECOME A MEMBER | DONATE NOW | MEDIA | SITEMAP
© 2014 Lady Bird Johnson Wildflower Center