Flowerbeds Puns

I was filling flowerbeds at work-a sport center and gym- with my dad(one of the owners), the groundskeeper- a father himself(lets call him GK), his son, and another co-worker.

two brothers, both in their late teens come out of the gym and wait for their dad to come pick them up. My dad sees them and asks if they want to help with the mulch- "its a free second workout!" A little later, GK says "Hey guys, you two should help with the mulch. We won't pay ya, but it'll help build up your muscles!". After the second time, you could hear the kids groan across the parking lot.

Aaand in come the brothers' father to pick them up. "Hey, look- they're mulching. you should help them. you two need to work on your biceps."

Three variants of the same dad joke in a matter of 15 minutes.