On Shavuos night, the minhag is to wait until it is night – Tzeis Hakochavim – to daven Maariv in order to have 49 complete days. (Shulchan Aruch w/Mishnah Brurah 494:1).
Likewise, it is preferable for women to wait until it is night to light candles and say Shehechiyanu on Shavuos night. (Luach R’ Yechiel Michel Tukatchinsky, Piskei Tshuvos 494:2)
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Isn’t that the famous K’hal Adath Jeshurun shul in Washington Heights? Their floral displays are legendary!