Answer: It's true that you prune FALL-BEARING raspberry varieties this way, but not summer-bearing or black raspberries. Your idea seems like a good one, but you'd have to space the plants well apart in order to avoid competition. Asparagus is a very heavy feeder that doesn't compete well, and brambles are so fast-growing and rampant that they'll probably inhibit the asparagus growth. But this is just my hypothesis. You can always experiment, which is half the fun of gardening, after all! Plant some asparagus in with the raspberries, and plant some separately, and see how the different plantings fare. I'd love to hear the results!
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