RMXP Farming System???

[hawwk]

Im looking to make a Harvest Moon type game, but I cant find a Farming system that doesnt use a crapload o variables and switches. is there any script that can allow many types of seeds to be planted, while they grow at a rate unique to each plant, depending on type of plant and date planted? i have a good day/night/date system (minutes, hours, days, seasons, and years)