If you are in the Northern Hemisphere and have any space available that gets at least 6-8 hours of sunlight per day you might consider planting a container or raised bed garden with your kids.
Editors note: we’ve had some experience growing vegetables with kids (Northeast USA) and our top choice for now (April 2nd) would be shelling peas. They are easy for kids to handle and they can go in the ground outside now (early spring). They take about 55-70 days to grow harvestable peas and our kids love to pick them and eat them raw. They are sweet and delicious and make a nutritious snack.
If you don’t have raised beds or room for a garden consider making a container garden. With peas you could make a trellis to encourage vertical growth (some varieties will grow taller than others), but don’t expect a giant harvest, it’s more of a daily snack.
Other kid favorites that we have tested:
For all these projects you’ll need good soil and some seeds. For containers you can reuse lots of household items if you get the right size for the plant.
Our recommendation is that you call your local gardening center or farm supply store and ask if you can order supplies for shipping or curbside pickup (during COVID crisis).
Here are some links to supplies you can get on Amazon in the US (please add comments with suggestions for other countries):
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Crowdsourced ideas for busy parents