There is a big difference in making a few bucks on a couple hundred plants and making a living. If making a living to you is something like $50,000, then you will have to sell many thousands of quality plants. Can your location support the traffic to sell many thousands of plants? Does your location have the population/market to sell many thousands of plants?
Cost of doing business so low? Nothing is free, if you try to grow enough plants to make a living, you will have to buy tons of potting soil, thousands and thousands of pots, trays to carry thousands of pots, some sort of fertilizer for thousands and thousands of pots, some sort of insect/disease prevention for thousands and thousands of pots, you will have to buy many thousands of quality seeds or plugs and bareroot perennials. You will need many thousands of tags for all the plants. You will need to buy signage and advertising.
And, what most don’t want to face, is that you will need a lot more facilities than just a big backyard. You will need some sort of setup to start thousands of seeds. You will need some sort of setup to display all these thousands of plants. The biggest single expense will be a greenhouse, to compete with any other nursery or big box store in your area you will have to have your plants ready and blooming when the customers are ready to buy, in my friend’s area that is April, May & June. You will not have much ready and blooming by April & May without a heated greenhouse that you will have to buy fuel for all winter.
Having said all that, my friend wouldn’t trade it for the world. He has 4 large greenhouses, two of them heated, a large outdoor growing area set up with a dripper irrigation system and a 600 sq.ft. germination room setup. Is he making a decent living at it, well let’s just say he haven’t quit his night job yet!