A lot of Dutch culture just is, and nobody really knows why, but it's always been that way and therefore it always will be that way. Sort of like the legendary "one-cookie" thing--it's so embedded in Dutch culture that even if you never actually encounter someone who offers you one (stale--it has to be stale, or else it doesn't really count) and only one cookie, that mentality follows you around like a shadow on a cloudy day, real enough but too vague to make much sense.
Thus it is with gardening. This year, I bought these kweekkisten, little prepackaged containers complete with soil and seeds, just add water. The idea was to infect kidlet with the excitement of growing things, but truth be told I don't think he quite realizes that the seeds are supposed to grow into things. He just had fun playing with the dirt. The Intratuin we went to was giving away little packets of seeds (we got sunflower) with every purchase--or maybe it was just to cute kids--so we'll also be planting those, but later, outside.
It's anybody's guess whether the seeds will actually grow, and if they do grow, whether they'll actually look anything like the green, lush plants that were on the pictures. In my experience, plants in pots rarely do, but you never know. And who knows, maybe kidlet will have a green thumb. Two euros per set is a fair price to pay to find out, right?