Gen Zero genetics are to replace your mother stock every 3-6 months. Gen 0 are typically made to order and will be anywhere from a few inches to 12" tall when shipped. 
Gen 1 Clones are great to test in your production and to supplement your clone inventory. Gen 1s will be in and out of stock based on rotation, and custom orders are available. Will be anywhere between 4-10" tall for proper shipment. 
All Gen 0s & Gen 1s will be rooted and hardened before they are shipped. 
Consider our Remediation Services for your custom genetics.