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Choosing Between 'Yuzu Nr. 3' and a Standard Yuzu for Outdoor Planting in Berlin

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Mirage:
Hey everyone,

I’m currently deciding between two Yuzu plants for permanent planting in a sheltered courtyard in central Berlin (Zone 7b, relatively mild microclimate):

Yuzu Nr. 3 from Lubera:
Sold as a young plant (about 40 cm), claimed to be very cold-hardy down to -17 °C . However, this is based mostly on Lubera’s own assessments, does anyone have real-world experience with this variety?

https://www.lubera.com/de/shop/switrus-yuzu-nr-3_produkt-2277980.html

Standard Yuzu from Zitronenlust:
Offered at a much larger size (130–180 cm). The listed hardiness is -12 °C.

https://www.zitronenlust.de/pflanzenkaufen/product-9-359.html

I’m leaning toward planting directly in the ground this summer. Given the courtyard’s protection from wind and decent winter sun, I’m hoping to get away with minimal winter protection once the plant is established.

Has anyone tested Yuzu Nr. 3 in real outdoor conditions?
How does it compare to regular Yuzu in terms of frost tolerance, vigor, and flavor?

Thanks in advance!
Would really appreciate any first-hand experiences.

Peep:
The tree needs to be grafted on Poncirus Trifoliata, it's the only suitable rootstock for you.

Lubera says it's on Trifoliata, but Zitronenlust doesnt mention the rootstock so I suspect it's something else. You could ask them to be sure.

Americ:
Unfortunately I don't have any experience with Yuzu No 3. I have been wanting to try it but haven't managed to get one yet. But I do have good experience with a yuzu that I grew from seed. I live in Bonn near the city center and the plant is in a pot outdoors year round on a sheltered roof terrace with southern exposure. It is growing very well. It hasn't experienced any frost damage up to now and has born fruit  the past two years.

Mirage:

--- Quote from: Peep on April 21, 2025, 10:17:26 AM ---The tree needs to be grafted on Poncirus Trifoliata, it's the only suitable rootstock for you.

Lubera says it's on Trifoliata, but Zitronenlust doesnt mention the rootstock so I suspect it's something else. You could ask them to be sure.

--- End quote ---

I have gotten the following response from them

"The stated frost hardiness of -12°C is guaranteed for adult plants; there are no more frost-hardy yuzu.
 
The rootstock can withstand even harder frosts, but the scion cannot, even when grafted onto Poncirus with weak growth."

That would imply that the yuzu is not grafted onto trifoliata, but I have sent a follow-up email to be sure.

Rei:
Hi!
I've been growing N3 Yuzu for a few years now in my zone 7b (north-eastern France), and I haven't had any issues with it. At -13°C, it did lose a few leaves, but that was it, no wood damage. It can probably go down to -15°C if established, probably with some dieback.

This last winter was mild for me, so I can't compare it to my other yuzu in hardiness. From what I understand, it was selected because it was heavier cropping than other trees, with good fruit quality, and was among the hardiest out of a few hundred seedlings. The original tree did survive and recover fairly well from -17°C.

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