Shiva Purana
वैशाख्यां तु विशाखायां कुर्यात्पुष्पमहालयम् ॥ ज्येष्ठे मूलाख्यनक्षत्रे शीतकुम्भं प्रदापयेत् ॥ ८ ॥
In the month of April-May on the full-moon day with the star Viśākhā he shall make the great temple of flowers. In the month of May June on the star Mūlā he shall offer a pot of cold water.
english translation
vaizAkhyAM tu vizAkhAyAM kuryAtpuSpamahAlayam ॥ jyeSThe mUlAkhyanakSatre zItakumbhaM pradApayet ॥ 8 ॥
hk transliteration by Sanscript