Wow Lin your Crotons are so beautiful, you do have lots of room for them. They can freeze here in zone 9b, so most of mine are in pots, some are in the ground, but they have taken a hit from time to time from the cold and never get that big.
I am a foliage lover and have 23 different Croton varieties. I would love to see pictures of everyone's Crotons.
These are my newest plants the day I bought them last March from the Leu Garden's plant sale at the Peters Crotons & Cordylines booth. I buy the smaller plants so they can adapt to our temperatures slowly here in Central FL.
Red Stripe
Mrs. Robinson
Batik