Interesting to hear how long the roots grow for you all. I guess my experience here on the sandy soil is a lot different from those growing on hard, compact soils. Roots can get very long here in a dry summer. In 2018, which was record dry, several were over 2 feet long. To connect to what Shawn said above, this was on areas that received deep irrigation maybe every 10-14 days.
In contrast, all roots were pathetic in the record wet summer of 2017.
In a normal year I still expect the roots to grow a feet deep and spread even more.
This year I see some differences between the ones growing in the newer sand beds and the ones standing in the more heavily amended kitchen garden. It is hardly surprising, but clearly the lighter the soil, the more roots.
