Whatever container you use, make sure there are drain holes and that the soil you use is free-draining. It might be best to go with name brand bagged soil or mix up your own with plenty of drainage material mixed in (e.g., perlite). You can plant right into the box of soil.

How many you plant will depend on the size of the box and type of plant. There are strawberries that generate long runners of babies and they will spread across the box (and will actually give you more plants). Others stay fairly compact. Many people grow them in hanging pots.

Just be aware that they do like sun but because of that, the soil can dry out quickly, so you want to make sure the soil will stay moist but not soggy, especially since they are surface-rooters (consider some pine needle mulch around the plants).

Otherwise, they are easy and fun to grow!

Hope this helps a little!

I'm a hydro grower and have a FREE tutorial on building a Strawberry Burrito.

It uses 100% perlite as the growing medium. I use home-brewed nutrient and the recipe is located in my online Store.

Relax, everything in the Store is FREE!

Here is a link that might be useful: Build A Strawberry Burrito