There are five additional states considering similar laws.

还有五个州在考虑实施类似的法律。

All 50 states recognize the April observance, although many hold an additional state Arbor Day in a month more suited to local tree planting.

所有50个州都承认4月为植树节，尽管许多州在一个更适合当地植树的月份额外举办州植树节。