Rough lemon cold hardiness?

[nullroar]

Anyone know the zone hardiness of Rough Lemon offhand? I just realized I have no clue, and a cursory google search has been very unhelpful.

Figured I'd ask the pros.

[Zitrusgaertner]

Anyone know the zone hardiness of Rough Lemon offhand? I just realized I have no clue, and a cursory google search has been very unhelpful.

Figured I'd ask the pros.

9b. C X jambhiri is not hardy at all.

[nullroar]

Thanks!

[1rainman]

Lemons as a whole are very cold sensitive. Hard to grow even in Florida. Other than meyer which is cold tolerant because it's not actually a pure lemon.

[Zitrusgaertner]

Other than meyer which is cold tolerant because it's not actually a pure lemon.

Rough Lemon is not a pure lemon either.

[Woodwords1]

The hardiness zone for Rough Lemon (Citrus jambhiri) is typically USDA hardiness zones 9 to 11. This means it can withstand minimum temperatures down to about 20°F (-6.7°C) to 40°F (4.4°C), depending on the specific microclimate and the extent of protection provided. Keep in mind that local conditions and care practices can also influence the plant's ability to survive outside its recommended hardiness zone. It's always a good idea to provide extra protection during colder temperatures if you're pushing the limits of your plant's hardiness zone

[SoCal2warm]

I tried growing seeds from fruits from a rootstock variety that had popped up, which I strongly believe was a rough lemon.
The seedling, which were grown to about 6 inches tall in containers were unable to survive a typical winter in Olympia, climate zone 8a, despite being on the deck only 5 feet from the house. It was a very vigorous grower though and did show some signs of mild cold tolerance, better than orange. 

The fruits were nothing anyone would want to eat, pretty bitter and low quality flesh, but pleasantly fragrant.