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I use this mix if you scroll down you can see the list of ham safe wild plants included.
If you grow your plants in soil your hams will probably have great fun digging in the pots so don't expect any plants to last long!
You can also just plant some hamster food! Sunflower seeds sprout really quickly, millet is a bit slow but often use in German cages, various other ham safe seeds can be grown too. I still wouldn't recommend keeping them in the tank full time though.

ETA another reason for not keeping the plants in the tank that I forgot to mention is that although plants release oxygen into the atmosphere during the day they release carbon dioxide at night so you would have higher levels of carbon dioxide in the tank when your ham is most active, not a huge amount but not particularly healthy.