Sunday, February 5, 2017

Winter-blooming Chains of Glory a.k.a. the Lightbulb Plant

After the holiday Paperwhite and Amaryllis flowers decline, there is usually a dearth of flowers at the Red House Garden until the blooming of earliest spring bulbs.  This year, however, my Chains of Glory is in bloom.

Chains of Glory plant
I bought this Chains of Glory plant, or Clerodendrum smithianum, three years ago from Logee's, a well-known nursery down in Connecticut that specializes in rare and tropical plants.  (They are known as a mail-order nursery, but if you ever have the chance to visit their greenhouses, it is well worth the trip!)  I am extremely negligent of my houseplants, so the fact that this one has survived to tell the tale is an indicator of how hardy it is.

Clerodendrum smithianum
Clerodendrum smithianum is actually a shrub or small, multi-stemmed tree native to Thailand that can grow up to ten feet tall.  For use as a houseplant, it is recommended that it be pruned after its winter blooming to keep it a more manageable size.  My plant has managed to stay nice and small thanks to two battles with spider mites and one unexpected and drastic pruning by a plant-hungry cat.  (Like I said, this plant is impressively hardy.)  When a mature plant is in full flower, the effect of multitudes of cascading flowers makes it easy to see where it gets its nickname 'Chains of Glory'.


Another common nickname for this Clerodendrum is the 'Lightbulb Plant', which I personally love.  Before the flowers fully open, they do rather look like little white lightbulbs.  I've also seen it called 'Indian beads'.

Lightbulb Plant
Clerodendrum smithianum is hardy to zone 9b, and prefers full sun to part shade, though direct afternoon sun can burn the leaves.  I have mine on a shelf near a south facing window.  It is a very long blooming plant as the flowers slowly open, starting with the top and working their way down. Mine has been in bloom for a month and is still going strong.  It is said that it can bloom twice in winter, so I am excited to see how long it will be in flower.  When grown in warmer climates, it can bloom for months.  It is a great plant for a hanging basket or as a patio plant, and it is sometimes even grown as a bonsai.  Chains of Glory likes fertile, well draining soil, and the soil should look dry before watering again.

Clerodendrum smithianum
Many Chains of Glory plants have both dark red stems and red star-shaped sepals which are quite showy in contrast with the white flowers.  My stems do age red, but the flower sepals of my plant are all light green with just a touch of red on the tips.


As far as botanical nomenclature goes, Clerodendrum smithianum's past appears to be quite mysterious.  Some online resources seem to think that C. smithianum is synonymous with C. schmidtii (also syn. C. hastato-oblongum C.B. Clarke).  This plant was first documented by E.J.Schmidt, a Danish oceanographer and naturalist who collected plant specimens from Koh Chang Island in Thailand in 1899, and catalogued by C.B. Clarke, a British botanist who worked at Kew.

Clerodendrum smithianum = Clerodendrum schmidtii ?
Other online resources, on the other hand, seem to think that C. smithianum is synonymous with the more similarly named C. smitinandii, a different species of Clerodendrum that was collected a few decades later by Tem Smitinand, a Thai forest botanist, and likely categorized by the American botanist H.N. Moldenke.

Clerodendrum smithianum = Clerodendrum smitinandii ?
All of these are known as 'Lightbulb Plant' or 'Chains of Glory'.  Is my Clerodendrum smithianum just another name for a different species, or is it its own separate one?  If anyone else knows, let me know! 

(p.s. If you would like to go down the rabbit hole with me, there is a paper published by botanists in connection with Chulalongkorn University that describes and illustrates the differences between the two other species.  My C. smithianum seems to resemble C. schmidtii the most to me, but I am no botanist.)

**UPDATE: I e-mailed Logee's and they replied back that it is, indeed, the same plant as C. schmidtii.  Mystery solved!


Whatever its origins, having a plant that blooms in the depths of winter is most definitely a thing of beauty!


20 comments:

  1. This is a gorgeous plant. I think 'Chains of Glory" suits it perfectly. Is it fragrant?

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    1. No, sadly it is not fragrant at all.

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    2. Scratch that, I looked online and it is actually supposed to be fragrant. I'm getting no smell at all from mine, though, unfortunately!

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  2. What a stunning plant, particularly tumbling down from above as you have it displayed. I can see where it gets its names. My first thought about the flowers is that they look like Gaura blooms--not the buds, but the open flowers. I looked it up--but they aren't even in the same family. Thanks for sharing information and stunning photos of this plant!

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    1. I thought the same thing! Isn't it funny how the flowers of totally different plants have a similar shape?

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  3. Lovely! How strange that it's not fragrant. I thought all white flowers were fragrant. Maybe only outside where the pollinators are?

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    1. Hmm, I looked into it online, and they do say that it is supposed to be fragrant. Maybe I have a defective plant, as I'm getting no fragrance at all from it!

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  4. I once had something similar in blue. The white is even prettier, especially with that cascading habit. Lovely!

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    1. Blue would be beautiful, too! I do love how it cascades down and fits the space so well.

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  5. What a lovely plant! Congratulations for keeping it alive for so long. Like you, I have a dreadful reputation for neglecting houseplants. If houseplants could run and hide, the shelves would be empty every time I set foot in a nursery.

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    1. Haha, I have killed way too many houseplants. It's survival of the fittest here when it comes to houseplants!

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  6. Your plant looks very healthy and happy, I must admit, I can't keep plants alive inside :-/ . I have a similar variety, C. wallichii (Bridal veil) but mine has to fend for itself outside in the yard.

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    1. Bridal veil is very similar to this one. I'm sure it's gorgeous outside in the garden! My plants outside definitely have a better chance of survival with Mother Nature to help out.

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  7. What a really charming plant. It's a new one to me.

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    1. I don't think it's very common here. It was hard to find much information about it. It might be more common overseas.

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  8. Very pretty blooms and the sepals remind me of succulents.

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    1. The sepals are quite pretty, and they are turning darker red as the blooms mature and fall.

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  9. Chains of Glory is a new one to me, Indie. I love how it looks cascading down your bookshelves and would love to replicate that effect. I am going to follow your source link and buy one. Thanks for the great info. P. x

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    1. I just checked Logee's wonderful website. Unfortunately, Chains of Glory is unavailable at this time. I've put a post-it on my desk to check back periodically.





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    2. Oh that is too bad. I hope they have it back in stock soon for you!

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