He thinks that's where its most "corrupt". This book is amazing!
This is not actually about nature it’s meaning nothing good can stay. In the outsiders this poem is used. When Johnny dies he says stay gold to Ponyboy meaning stay good.
If raining lunchtime, (I'll remain indoors. )
Or
If it's raining at lunchtime time, (I'll remain indoors.)
(when you know it may rain)
Or
If it rains lunchtime, (I'll remain indoors. )
(when you're not sure it's going to rain)
Hope this helps!