This idea I tried several years ago when we were planning on having a garage sale. A few months before the sale I started a variety of houseplant cuttings in water to develop root systems, and a couple of weeks before the sale I potted them. I priced them at $3 to $8 each and sold them all.
I have been to other garage sales over the years and have seen yard plants for sale. The owners just separated or dug up their plants, put them in pots and sold them.
You’re not going to get rich doing it but it can make a tidy addition to your garage sale cash box.
Interesting Ways to Make Some Side Cash
Can You Turn Your Hobby into Income?
Ten Ways I Have Made Money Since Losing My Job