Why are there many plants that can be grown in a greenhouse, but some, like ramps and truffles, that can only be grown in nature with conditions that can’t be mimicked in a greenhouse?

Question

Why are there many plants that can be grown in a greenhouse, but some, like ramps and truffles, that can only be grown in nature with conditions that can’t be mimicked in a greenhouse?

In: Biology

Answer 1

Because truffles grow on the roots of hardwood trees. Hardwood trees take decades to grow and can’t be grown inside a greenhouse due to their size.