We took a tree out of a flowerbed in the front of our yard. It took a fair bit of mass with it, leaving a substantial hole. We had just retired a couple of old compost bins, so we had a lot of compost. So we filled the hole with fresh, and perhaps not completely mature compost.
We got some of the most interesting weeds. In addition to the usual assortment of weeds, we have some fruits and veggies. We have a really healthy zucchini, and it's not a hybrid pumpkini! We have a tomato plant and what appears to be a tomatillo plant. And we have what appears to be two very healthy melon plants.
If I'd planted them intentionally, I probably would have spaced the melon and the zucchini a little better, but they seem to be happy snuggled up together.
I don't actually know what kind of melons these are. The leaves look like a cantaloupe, though they're larger than the cantaloupes I've grown in pots. But the fruit itself shows some signs of watermelon-ness (I've grown both in the past, but no other melons).
It seems perfectly happy growing in our flower bed, so we'll let it grow there for a little while and see what we get.
Serendipitous gardening. How fun!