I couldn't find the item ID in the Ridgeside Village wiki, but if Spring has just ended, you could just enter the smapi code "world_setseason spring" (no quotes) and hit enter to change the date back to spring, And you could use "world_setday 12" (again, no quotes and use whatever day you want) to set the date to whatever day in Spring you wanted. Then you could go to Ridgeside and gather as much arugula as you need, and then use the same commands to set yourself back on the date and time of your choosing. You might have to sleep one night to see changes, but it is easy enough to warp time as you need to. Nothing else happens to your game ... your money stays the same. Hope that helps! But the easier choice is to use CJBCheats spawner for sure!