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At first I was thinking, maybe alfalfa. .. but, it's not as interesting as an actual vegetable or flower growing with the help of different genres of music.
Regardless, a good way to get the seeds starting to germinate faster is to let them soak in a small glass of hot water for about an hour or two prior to planting them. I use a little shot glass, set them in a sunny area, &wait until the water becomes cold or room temperature. They should pop up within the same week depending on the type of seed.
Also, trying searching the internet for the easiest produce to grow or easiest flowers so you guys know for sure there won't be any fail to this project just in case!

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Do a Google search for 'survival seeds' or 'heirloom seeds'. You will find many sources of mail order seeds.
Also check with local garden centers or greenhouse. Most are stocking some heirloom seeds now.

We have thousands of articles that can be of great help to novice and experienced gardeners.

Here is a link with more information.

https://www.gardeningknowhow.com/edible/vegetables/vgen/heirloom-vegetables.htm

The back of a seed packet generally has information on planting depth, seed spacing, days to germination, and spacing after planting.
It generally tells you when you can place the seeds outdoors, which is the month range that you mention.

https://www.gardeningknowhow.com/garden-how-to/propagation/seeds/seed-packet-information.htm

It depends what kind of seeds you have. Most seeds of common vegetables will germinate in about 1 to 3 weeks, but there are seeds that take longer. Some mint family plants take about 1 month on average to germinate, and some more exotic plant seeds can take months. Also, look up the species to be sure the seed does not require special treatment, such as cold stratification, before germination.

This article will help you.

https://www.gardeningknowhow.com/edible/herbs/cotton/cotton-growing-kids.htm

If you have conditioned water, I would suggest letting it sit out for 48 hours before using.
You can also use distilled water.