you don't need to sterilize it actually.
make sure it has no chemicals (fertilizer usually)
keep it the correct moisture.....

......as for plants.......most will be ripped up and smashed..try looking around the local nursery/garden center.....grasses would do but need too much light probably,little palmettos would get too big, not sure of a plant at the momment......GOOD silk plants look real enough...make sure they don't have wires in them that could stick a snake.....

.......you could get off with rocks and wood or cork bark even......

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US born and bred balls have less calories
US born and bred balls have less cholesteral
US born and bred balls lead to less hair loss for owner
US born and bred balls speak English also.....Yep

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