Location: Graham, Washington [Zone 7b, 47.041 Latitude] 41inches average annual rainfall, cool summer drought
posted 4 years ago
I don't know of any lists of leaf litter per tree but I know Paulownia Elongata produces an immense amount. I'd expect the same of Tomentosa [which might survive in your climate, online it's said to go down to Zone 5, not sure what your local 'average low temperature' is]...
Red Alder too, but I don't believe that's hardy to your area [but other Alder might be.]
Just as important for some designs is not just how much leaf litter is produced, but over what timeframe, and how durable is it to weather and decay. A Paulownia might drop a lot, but after a few rains it's pretty much gone. A eucalyptus or holly or pine tree might not produce so much, especially not all at one season (true of many evergreens), but what is dropped is durable and relatively resistant to decay, and can last for years and build up a thick mulch. This can be a resource in certain settings and climates, and a problem (such as a fire hazard) in others.
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