The game page says the garden keeps growing while you are offline. You can log out after watering and come back to fruit that continued. That does not skip a thirsty plant you never watered, and it does not sell the fruit for you.
Sleeping is a second boost, and it was read off a prompt inside the house: the farm grows 1.5 times faster while you sleep. Use it when you can stay in the session. Offline growth is what remains after you actually leave.
The Land Office is where the tutorial says you upgrade the farm and the house. A land-expand control was visible in one session. Every price on that screen is live. Nothing here lists a plot cost, because none was published.
A practical loop once the first kalamansi is sold:
- Plant and water the plots you already have.
- Sleep in the bahay kubo if you want the 1.5x prompt.
- Log off if you are done. Growth continues.
- On the way back, harvest, sell, pay any water bill, then decide if the Land Office price is worth the pesos you just made.
House customization is real: the game page says to customize the farm and build the garden, and the supply shop had a featured furniture section. Furniture prices are on those tags.