No sense firing up the motor and annoying the neighbors every few days. When we shred mint, lavender, lemon balm and sage trimmings, you can smell the fragrance down the block. Some things shred better than others. Think linear when feeding the shreddables into the maw of the machine. In shredder terms, bushy is bad, streamlined is good.
Some plants are incredibly fibrous, like iris swords, and tend to string out rather than cut.
I have removed the grill and now let the shredded material exit on the first revolution, which eliminates the stopping to untangle the clogs, however it does result in a larger particle. If the chunks are too big, I'll scoop 'em up and feed 'em through again. Don't shred morning glory or other rhizomous rooting weeds because you'll get millions of 'em for the price of one. Try to shred your weeds before they set seed. Some words of shredding safety advice.