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
2 ratings

Thursday - March 01, 2007

From: Van Alstyne, TX
Region: Hawaii
Topic: Invasive Plants, Non-Natives, Herbs/Forbs
Title: Avoiding planting Indian Paintbrush in Hawaii because of invasiveness
Answered by: Joe Marcus

QUESTION:

My daughter is living in Hilo, Hawaii. For her birthday, her boyfriend ordered her some Indian Paintbrush seeds. Trying to be sure she grows them correctly in a pot, she found instructions that say Paintbrush needs a "host plant" to be successful. What would be a good host plant for her to use? Thanks!

ANSWER:

Parasitic plants come in several flavors. Among them, there are obligate parasites, which must parasitize a host plant in order to survive and receives all of its nourishment from the host plant. These plants typically lack chlorophyll. There are facultative parasites which will opportunistically parasitize a host plant given a chance, but can survive and complete its life-cycle without a host. These plants are often called hemiparasites or hemiparasitic plants.

Indian Paintbrush (Castilleja spp.) is typical of this group of plants. It can and will parasitize neighboring plants via root connections if living in close proximity, but will also grow and reproduce on its own if no host plant is available. The various species of Indian Paintbrush native to Texas often parasitize plants of the grass family (Poaceae), but they really aren't particularly picky about who their hosts are and will attach themselves to and draw nutrients from any number of plant species. Indian Paintbrushes growing with the assistance of a host plant will almost invariably outgrow a sibling without such benefits. Likewise, a host plant parasitized by a Castilleja will normally suffer quite noticably.

One species, Castilleja arvensis, native to Mexico, Central and South America has naturalized in Hawaii where it is found in association with, and parasitizing the Hawaiian native plant Dubautia scabra. Ecologists consider it invasive in Hawaii. Other Indian Paintbrush species could be similarly ill-mannered in the Hawaiian paradise.

We would urge your daughter to exercise great care and help protect the fragile Hawaiian ecosystem by ensuring her non-native species does not escape from cultivation. She can do this by using her flowering Indian Painbrush stems for cut-flowers and never allowing them to make seeds, or she could simply choose to not plant the seed at all and avoid the risk. After all, no one wants to be the source of an ecological disaster.

 

More Herbs/Forbs Questions

Cutting Gardens from Charlotte, NC
July 30, 2013 - I want to plant a year-round picking garden for flowers to bring into my home. I want to look at landscape plans in lieu of throwing down wildflower seeds. Can you suggest a few websites for ideas?
view the full question and answer

Freeze damage to salvias in Port Townsend WA
January 21, 2010 - Mr. Smarty Plants, We live in western Washington and had a multi-day hard freeze in December. Now, in mid-January, our salvia hot lips has no live leaves on it. The leaves that remain are green and...
view the full question and answer

Chile pequin from Spring Plant Sale in Austin
June 08, 2011 - Re: chile pequin purchased at your Spring 2011 sale: it grows, seems to thrive, but sets no flowers and so bears no fruit. It's in terracotta in Ladybug potting soil, on a shady apartment patio. How ...
view the full question and answer

Do Salvia coccinea and Salvia occidentalis occur in Hawaii
April 27, 2008 - Aloha, Would you please happen to know if the salvia occidentalis and the salvia coccinea are growing in a wild state in Hawaii, the quantity (small or large areas? What are the weather conditions ...
view the full question and answer

Removal of invasive roots of Turks Cap in College Station TX
April 29, 2014 - I know people have asked you questions about propagating Turk's Cap, but my question is a little different. I have this plant growing in several locations, because I have a large garden with lots...
view the full question and answer

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