The Hot House needs to be built in order for you to use it. You can have Ken build it for you for 50000G and 600 wood. You can grow flowers and herbs year round inside the Hot House and the plants inside are not affected by storm damage. Once built, the Hot House will be located next to the wood bin in the southeast corner of the farm.
There are two sides to the Hot House. The left side holds the flowers and the right side holds the herbs. You can buy flower and herb seeds from Daisy year round, but first you have to buy pots to plant in. Pots are also sold by Daisy and she charges 200G a piece. You need 32 pots to fill up all of the shelves in the Hot House. Pots are taken out of the bin to the right of the door and placed on the shelves. Once you put a pot on the shelf, you cant remove it if there is something planted or growing in it. If there is nothing in the Pot you can (if you want) pick the Pot up off of the shelf and place it back in the Pot bin.
Daisy will sell certain seeds depending on what gender your farmer is. If you choose to be a boy, she will sell Sage, Saffron, Geranium, and Primrose seeds. If you choose a girl, she will sell Rosemary, Camomile, Lavender, and Orchid seeds. If you want to grow the other gender's plants and to fill in the information in Mary's book on plants, you need to trade seeds with another gamepack via the Gameboy link cable. Information on link cable trading can be found in the Trade Center section.
If you try to grow a flower seed in the herb portion of the Hot House, the seed will never sprout. Likewise if you try to plant a herb in the flower portion. The icon for the flower seeds look like a paper bag folded over and the icon for the herb seeds looks like a bag with rabbit ears. You can only plant one seed per pot. Don't forget to water your pots each day! The pot will change to a darker color once it has been watered for the day.
Bill, who runs the Tool Shop, will have Scissors for sale which you need to harvest your flowers and herbs when they bloom. To use the Scissors, just equip them and press the A BUTTON when you are standing in front of a pot. You will be able to pick the flower out of it's pot and place it in the shipping bin located to the left of the Hot House entrance.