And to come fully back to topic, I have used all sorts of grocery store seeds for this sort of guerrilla gardening.
I've started or grown inside ( not frost hardy) mango, avocado, starfruit/carambola, dragonfruit/pitahaya, lychee, guava, passion fruit, papaya, and pineapple. pineapple is the only one I've eaten fruit from.
Outside, in my yard or elsewhere i've planted seeds from almost any hardy fruit/vegetable with seeds. Peppers sweet and hot. I was surprised, these seem to come true or close to the parent fruit. Tomatoes, cucumbers, squash, pumpkin, others I'm sure I cant remember.
Also, potatoes that are growing eyes can be planted, ginger and turmeric and haldi have all grown from store bought root bits, sweet potatoes/yams as well, and chickpeas/lentils/lima/broad beans have all grown for me from grocery store food packages, and seemed true or close to the parent plant. Also try berries. Wolfberries (goji) grew easily for me from dried berries purchased in the store. Most berry type fruits germinate well after fermenting, so as you pick out the dead/moldy berries from a package, these can be planted as is.
For guerilla gardening, don't forget that herbs are useful, edible, and pleasant, so adding a little snippet of rosemary or thyme, or oregano, or mint, depending on location/climate, or even tossing out a few mustard seeds/fenugreek seeds/cumin/fennel/dill/coriander(cilantro) from the spice cupboard, might enliven a border somewhere. Poppies also fall into this category, in my opinion. Attractive, grow in most climes, can be medicinal, and edible seeds if allowed to ripen. Unfortunately, I have not gotten storebought hemp to germinate, nor found a cheap source for viable seed, or I might be inclined to scatter it as well.
Also, many plants generate a surprising amount of seed. I have over 2l (1/2 gallon) of kale seeds, even more Parsnip, almost as much rhubarb, probably one liter of ornamental snapdragons and lesser of other like plants. I pick up and save seeds from town/municipal/roadside planters, gardens abutting the roads I walk along, and almost anywhere else I pass by them. Sometimes I forget to label them, so I do have a small collection of mystery seeds.
