Anyone who has a home compost system knows that the temperature doesn't get very high. In a good system, it will get high enough to break down plant material, but it usually doesn't get high enough to actually kill seeds.
That's one of the reasons I throw weeds in the garbage rather than the compost pile.
It also means that when you use your home compost, either in your garden or in your potted plants, you can get some unexpected results. The soil in my pots was looking a little dry and compacted earlier this spring, so I added several big scoops of compost.
I grow tomatoes and flowers in the same pots. This year, I'm also growing either cucumbers or melons of some kind, thanks to my home compost. Some melons and cucumbers come from the same plant family name (Cucurbitaceae), which is why they all look alike before they actually begin to produce fruit.
My mystery melons or cukes are just barely starting to flower and have yet to form fruit, so I can't tell what they are yet. I'm guessing my pots may be a little too crowded now, but I'm just going to let everything grow anyway.
Wow, the mystery, surprise and intrigue never end for a home gardener!