How do you make 1star crops?

[Kiryuu]

I want to make 1star strawberries and 1star wheat. How can I do this?

[lilisaur]

This is unlocked when you have 10 different crops growing at IOA. This can only occur once the second set of Explorer Shores (Iridescent Island and Sunny Sands) become available and give you some new crop seeds to pass the threshold of ten. You can only get to nine after the first set (Soggy Skerry, Blossom Bay, and Bamboo Bluffs.)

Not every crop has a 1-star version. Wheat for example does not have a 1-star version. But those that do will automatically grow the 1-star version about 10-20% of the time. (Plumpkin additionally needs a 2x2 area in which to grow; if only given 1 square it will never appear.) The Builder does not need to do anything to cause them to randomly appear after 10 crops are grown (besides giving Pumpkin patches some extra space) and there is no known method to improve the frequency of 1-star crops appearing.