"Why are we having flowers less often at worship?"
I suggest three reasons for the decline in floral altar arrangements on Sundays;
1. The congregation has gotten smaller over the last few decades so we have fewer people to donate flowers.
2. Flowers are not as popular as they used to be. I have noticed a decrease in the number of floral sprays at funerals. People prefer to use their money on other ways.
3. Flowers have become much more expensive.