| I have never moved them before .. sorry. Transplanting is always risky and tends to be more of a problem with age since bigger root systems make damage to roots more likely unless a large enough hole is excavated ... you may need to check out pro help that will have the large gear needed to make such transplants ... trees as large as houses can be moved if done right. Making reference to Mary & Garry Irish's book, " Agave Yuccas And Related Plants .. A gardeners Guide" ( By the way a great book ) ... I will paraphrase ... Stemless plants such as Dasylirion can be moved with greater success if moved when stemless ... Dasylirion is best moved when the weather is cooler but not cold ( perhaps early spring in your area ? ) .. this is advisable since watering is needed to establish roots BUT the transplanted roots are also very prone to rot .. so warm weather transplanting is not a good idea ... if the new site has more sun then the original site some artificial shade will helpful to transition the plant. It is much better to move plants when stemless. I think a key factor is : Do you have the man or machine power to move the plants with enough care to avoid damage to the roots and stems ?? Transplanting is always a bit of a gamble. Myself ... I have not seen the situation but I would only move the plants if I had to move them and commited to using the right gear ... big plants are heavy. Good Luck. Good Day ... | 
