There's little money in plants, no one is selling violets over the internet. 450k is alot of money.
It's almost impossible to ship plants via post as well. People try, but variables in weather and packing costs reduce quality and profitability.
There is a niche market in succulents; that are easier shipped ; but 450k worth, doubtful.
The only branded plants on a large scale, currently in the marketplace are Proven Winners. These are distributed via trucks too ones local garden center.
Best guess this is a Cannabis play; by 1 -800 Flowers or a long range play on Cannabis plants selling via post. Or some portal for Cannabis. Ultimately starter seedlings may be legally sold, already are in Maine. Unlimited seedlings allowed and 6 plants in flower home grow and 12 vegatative. Thats a small farm in ones garage. People would happily pay $20 for a 4 inch weed. For reference a violet or kalanchoe ( or most 4 inch plants) retail at best for $3.99. Most have 16 or more weeks bench time. Cannabis a nice plant 4 weeks, or less. Grows like a weed.
It's a fascinating new world in Cannabis; all sorts of plays going on