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Agathis robusta


ahosey01

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Shout out to @Silas_Sancona for turning me on to this tree.

Its a broad-leaf conifer native to Queensland.  San Marcos growers reports significant cold tolerance. An established specimen of theirs took 18F with no damage.

Planted this out from a 15 gallon.  So far, temps are down between 25F and 34F nightly, but back up to 70F+ each afternoon.

Wondering if these could become more popular in cultivation once the hardiness to both heat and cold is better understood.

image.thumb.jpg.2caa58dd24f0683a18781cf03fdf70a9.jpg

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27 minutes ago, ahosey01 said:

Shout out to @Silas_Sancona for turning me on to this tree.

Its a broad-leaf conifer native to Queensland.  San Marcos growers reports significant cold tolerance. An established specimen of theirs took 18F with no damage.

Planted this out from a 15 gallon.  So far, temps are down between 25F and 34F nightly, but back up to 70F+ each afternoon.

Wondering if these could become more popular in cultivation once the hardiness to both heat and cold is better understood.

image.thumb.jpg.2caa58dd24f0683a18781cf03fdf70a9.jpg

For most small yards, these will get too large.. or intimidate the heck out of some people once they're towering high above..  Ideal for parks / larger estates though. Question, at least here, is how well they'll tolerate our unique flavor of summer heat/ lack of rain/ low humidity.  Story behind moving the specimen at the Huntington is pretty interesting.

Selby Botanical's Agathis r. Sarasota, FL.  2/27/16:
DSCN0349.thumb.JPG.3e82d80a310d22f177a7591911fd6fc4.JPG

 

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12 minutes ago, Silas_Sancona said:

For most small yards, these will get too large.. or intimidate the heck out of some people once they're towering high above..  Ideal for parks / larger estates though. Question, at least here, is how well they'll tolerate our unique flavor of summer heat/ lack of rain/ low humidity.  Story behind moving the specimen at the Huntington is pretty interesting.

Selby Botanical's Agathis r. Sarasota, FL.  2/27/16:
DSCN0349.thumb.JPG.3e82d80a310d22f177a7591911fd6fc4.JPG

 

Yeah - this is going to be a big boy.

Currently, it's partially under the canopy of a 40ft Fraxinus pennsylvanica.  Eventually, I'm gonna have to whack back some larger branches on the ash to let this thing grow up and through.

That - or I'll be dead by that point and my kids will have to do it.  LOL.

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Good luck.  I tried Agathis robusta in Austin, TX about 5 years ago.  Received a beautiful 2-3 foot seedlings from a well known mail order company.  Planted it in shade and it promptly died. Not sure if it was our alkaline soil or our summer heat and humidity.  Very cool plant. 

I had the same luck with Wollemia.  Bunya Bunya did well until a hard winter though.

Edited by Austinpalm

Clay

South Padre Island, Zone 10b until the next vortex.

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4 hours ago, Austinpalm said:

Good luck.  I tried Agathis robusta in Austin, TX about 5 years ago.  Received a beautiful 2-3 foot seedlings from a well known mail order company.  Planted it in shade and it promptly died. Not sure if it was our alkaline soil or our summer heat and humidity.  Very cool plant. 

I had the same luck with Wollemia.  Bunya Bunya did well until a hard winter though.

It seems strange that it would have been the heat, given that they're native to a very hot part of Queensland.  I planted it in some tremendous soil with a neutral PH, so - fingers crossed.

I'm going to erect a shade structure and allow the tree to grow upward into the unprotected sun.

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I have one planted at my place [zone8-9ish], it has been in the ground a few years and is about 10' tall now. The new growth got burned at around 25F this winter, but otherwise it has been doing well.

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love this t ree --- rooting a cutting to grow here in Jax ----- I have a big Bunya Buny and a Hoop Pine in the yards as well as the Brasilian Araucaria angustifolium 

 

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  • 6 months later...

Update - will post photos later - but the tree is pushing a ton of new growth and looks unphased after two weeks of 110-115 temps.  It has a funky lean to the main trunk, which you can find in a separate post, but I'll post a shot of the whole thing shortly.

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  • 4 months later...

Kathy Musial has written a nice blog post about The USA's biggest Agathis robusta, at the Huntington Botanical Garden, with the history of its improbably successful transplanting back when Huntington began building his mansion:

https://www.huntington.org/verso/2021/11/seeing-forest-trees

 

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Jason Dewees

Inner Sunset District

San Francisco, California

Sunset zone 17

USDA zone 10a

21 inches / 530mm annual rainfall, mostly October to April

Humidity averages 60 to 85 percent year-round.

Summer: 67F/55F | 19C/12C

Winter: 56F/44F | 13C/6C

40-year extremes: 96F/26F | 35.5C/-3.8C

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  • 3 months later...
On 1/6/2021 at 9:25 AM, Austinpalm said:

Good luck.  I tried Agathis robusta in Austin, TX about 5 years ago.  Received a beautiful 2-3 foot seedlings from a well known mail order company.  Planted it in shade and it promptly died. Not sure if it was our alkaline soil or our summer heat and humidity.  Very cool plant. 

I had the same luck with Wollemia.  Bunya Bunya did well until a hard winter though.

Can I ask where you bought it from? I’d like to try this tree.

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