Repotting the Tiger Orchid

On June 28, Aquatic House curator Dave Horak and members of the Horticulture staff repotted BBG’s Grammatophyllum speciosum, commonly known as the tiger orchid. Considered to be the world’s largest orchid species, the plant on display at BBG is a beautiful specimen weighing approximately 300 pounds.

The basket holding BBG's Grammatophyllum speciosum, commonly known as the tiger orchid or great orchid, needs to be replaced. Years in the hot and humid conditions of the Aquatic House has caused the basket to rot, and the orchid needs to be repotted in a new one.

The orchid was purchased for BBG’s orchid collection in 1998 from the estate of Don Richardson, a prominent orchid specialist and head grower for Greentree, the 400-acre estate of Mr. and Mrs. John Hay Whitney in Manhasset, Long Island.

BBG’s Grammatophyllum speciosum has only blossomed twice since coming to the Garden; blooming requires a tremendous amount of light and heat that isn’t always easy to provide given Brooklyn’s winters, even in a glasshouse. The short day length and lower light intensity of this latitude makes blooming an uncommon event here; the last time it flowered was in 2008.

Tiger orchid (Grammatophyllum speciosum) in bloom. Photo by Dave Allen.

In its natural habitat in tropical Asia, the tiger orchid grows as an epiphyte in crotches of sturdy trees, where its roots intertwine to capture leaf litter and other sources of nutrients. In BBG’s Aquatic House it is planted in a wooden basket and fertilized frequently. Over the past five years the basket had begun to deteriorate, threatening to drop this heavy plant into the pool below.

Plants living in the pool below the Grammatophyllum speciosum must be moved out of the way before the plant can be lowered.

Aquatic House curator Dave Horak runs a support line that will be attached to the basket to lower it.

The hook of the support rope is in place and ready to bear the weight of Grammatophyllum speciosum, considered the world's largest orchid species.

Curator Dave Horak (in pool) and BBG staff discuss how to best lower the orchid to the pool, where it will be repotted.

Dave Horak guides the orchid to pool level, where the old basket will be cut away and the orchid repotted in a new, rot-resistant basket.

Curator Dave Horak inspects the plant and moves the support table into place.

Cinder blocks are put in place to keep the orchid out of the water as it is repotted.

BBG’s Dave Horak and Uli Lorimer guide the orchid on to the platform.

A shade cloth doubling as a drop cloth is placed in the pool under the orchid and surrounding area to catch any debris that may fall once the orchid is removed from its basket.

Curator Dave Horak carefully cuts through the long metal screws holding the old orchid basket together.

After cutting through the old basket, the orchid is lifted so that the lower part of the basket can be removed. Since the plant has grown through the top slats of the basket in several places, they have been left in place and wired to the rigging to help support the plant as it is lifted. Even with the top slats in place, the entire weight of the plant is borne by the stemlike pseudobulbs that have grown through them.

As the orchid is carefully lifted out of the old basket, the roots and pseudobulbs are examined and decaying material removed.

The underside of Grammatophyllum speciosum.

Once the old basket is down, it is easy to see the extent of the rot and broken slats.

Senior arborist Chris Roddick mans the hand crank and guides the line used to raise and lower the plant with the help of grounds foreman Leonard Paul and arborist Travis Wolf.

Grammatophyllum speciosum from above as it awaits repotting.

The new basket was constructed by David Mueller, a BBG volunteer, and is made of ipê (Tabebuia species), a heavy, neotropical wood very resistant to insects and rot. The repotting of the orchid was a long process taking seven hours.

The new basket that will house the orchid is assembled by senior foreman Lou Provost and Dave Horak.

Charcoal is added to provide the “bones” of the potting mix; as other components of the mix break down, slow-decomposing charcoal allows sufficient drainage and air exchange for the survival of epiphyte roots, prone to rot in dense soils.

After adding charcoal, fir bark is added to the new basket to help with aeration and drainage.

Fresh potting medium in the new orchid basket.

The new orchid basket is lowered onto the support table in the pool.

BBG’s Dave Horak and Uli Lorimer center the orchid above the new basket and ready it to be lowered into place.

The orchid is successfully lowered by a hand crank into the basket, and Dave Horak and Uli Lorimer carefully remove the remaining slats from the old basket to allow the plant to grow without constriction.

Curator Dave Horak carefully measures and attaches the metal wires that will suspend basket.

The team begins to lift the orchid in its new basket, checking to make sure it is level and balanced.

Dave has decided to move the orchid a few feet away from its original position, so a new support line needs to be added. The team sets a ladder in place for arborist Chris Roddick, who will climb up and set the line.

Success! The Grammatophyllum speciosum is hanging beautifully in its new basket in the Aquatic House.

Comments

July 19, 2010
Laurence May

Fascinating article with great photos.  Thanks.


December 17, 2010
Mary Ann

Repotting an orchid is no easy job. And to repot a tiger orchid of that size must have been a difficult task. It is such an amazing plant. Thank you for sharing this journey. Congratulations and may your orchid be happy in its new home. For smaller orchids of course, orchidcarezone.com is a great resource.


December 28, 2010
Emily Velde Elias

good to follow your work.  Inspiring.


May 1, 2011
Anita Arphan

I have this great orchid in my garden here in Kuala Lumpur/Malaysia and I am still waiting for the orchid to flower. It’s been now over 4 years and nothing yet. Heard in a nursery the other day that there are apparently male and female plants and I really hope that mine belongs to the female species. And they had this orchid outside which was about double the size of the one in the picture, 10 years old and NO flower yet.


October 6, 2012
tassin Bernard

Bravo for this good job: well prepared and executed. Fortunately, it is easier my colleagues and me when we repot even our biggest plants. Surely I’ll visit your garden on my next visit to NYC.

Orchid grower in France


April 12, 2013
claube

Fantastic!


May 2, 2013
Louise D. Suhey

After reading about this plant in the Orchid Thief by Susan Orlean, I had to see what it looked like. Fascinating to watch your staff repot such a large specimen. Ms. Orlean states the specimen displayed at the 1850 Crystal Palace weighed more than two tons and broke the record. Would have loved to have seen that one!


July 2, 2014
Ilka Celeste Robles

Fantastic! I own one of these beautiful and exotic orchids. Wish I can see mine as beautiful as yours and flowering soon. I live in Puerto Rico, a tropical island, so maybe I will be lucky with the flowering.



Add Your Comment

Please keep your comments relevant to this article. Comments are moderated and will be posted after BBG staff review. Your email address is required; it will not be displayed, but may be needed to confirm your comments.

Name:

Email:


WeddingsGarden News BlogCalendarOnline ShopPress Room

Hours

Tuesday–Friday:
8 a.m. to 4:30 p.m.
Saturday & Sunday:
10 a.m. to 4:30 p.m.
Closed Mondays
Closed on Christmas

More Information

Admission

Members Free
Adults $10
Seniors (65 and over) $5
Students with a valid ID $5
Children under 12 Free
Winter Weekdays Free

More Information

Directions

150 Eastern Parkway
990 Washington Avenue
Brooklyn, NY 11225

subways

Maps, Parking, and Directions

Join BBG

Become a Member

  

BBG Member Benefits
Free Admission, Special Events,
Discounts, and More!