Life Cycle and Reproduction

White truffle, Tuber magnatum, takes a whole year to grow enough that its edible to eat. White truffle harvesters start in January and end at December. In the diagram below you see that starting from January up until March the truffle is growing. After March, the truffle begins to mature and ripen all the way to July. In August through November, the fungi present in the roots of the trees produce gametes which fertilize to give Vegetative hyphae (haploid), which absorbs the nutrients from the environment supporting new hyphae’s, and Ascogenous hyphae (diploid). These hyphae’s produce spores that are absorbed into the soil to produce new fungi’s. In December the fungi is created.

  

Life Cycle of Tuber magnatum year round.
http://www.trufflesaustralis.com.au/pages/about-truffles/truffles-life-cycle.php