Thank you so much for that reccomendation. I will give it a try. I have a couple "Veji Bags" that I store lettuce in. Of all the dumb things I've bought online the Veji bags I do not regret. They really do work. I don't get through a day without something green. I'll give the white cabbage a try.
David3 is right. I didn't think that i should tell you about "emergency measures", such as raw potatoes or "pine beer", because the times when i had severe vit.C deficiency are gone, and i "have relaxed".
3 emergency measures:
1) I've just been talking to my mom about raw potato juice. When i was little, i was suffering from mild (and not so very) scurvy. It's no wonder, that if it wasn't scurvy, then it was stomatitis (that's how my life looked: stomatitis-scurvy-stomatitis-scurvy, etc.) The only real cure for it was raw potato juice. We couldn't afford juicing potatoes, so i just was chewing a big chunk of raw potato for an hour. It always helped. When the hard economical crisis was gone, we started eating more diversed diets, and stomatitis rarely occured (scurvy never occured to me again). So, raw(!) potatoes and raw potato juice can do wonders to you. Nevertheless, it's not recommended to swallow raw potato chunks, because it's very starchy, and who knows what reaction it might cause in your stomach... But, in general, drinking potato juice is safe, and i would recommend trying a whole course of this treatment, until you feel some results.
2) When i got older (about 15 y.o.), slight stomatitis appeared again. I went to the woods (not far from our summer cottage), got some branches from young(!) pines, steeped them (with needles) in room temp. water for 1 night and drank it up. Of course, it helped, because "pine beer" is a powerful remedy from scurvy, though strictly speaking, it's not "pine beer", just steeped branches. So if you have pines at where you are, you may also try this remedy.
3) As a dweller of ~60° latitude, i got used to birch juice since my childhood, though i don't drink it anymore (i don't need it that much). It's considered a wonderful remedy for scurvey and stomatitis (vit.C deficiency), and other health conditions. It's super beneficial on many many points. I doubt that there are birch woods in your area, but if you ever find birches at where you are, you can attach a DIY juice collector to a tree (it's easy to make), wait for a day and enjoy drinking birch juice (sap).
P.S. i repeat that chewing raw potatoes and drinking raw potato juice is a magic pill for treating scurvy. At least, it's always available even for citizens who live in concrete jungle.