Shiva Purana
आषाढे चोत्तराषाढे पवित्रारोपणं तथा ॥ श्रावणे प्राकृतान्यापि मण्डलानि प्रकल्पयेत् ॥ ९ ॥
In the month of Āṣāḍha and in the northern month of Āṣāḍha one should plant sacred objects In the month of Sravana one should also arrange other ordinary circles.
english translation
ASADhe cottarASADhe pavitrAropaNaM tathA ॥ zrAvaNe prAkRtAnyApi maNDalAni prakalpayet ॥ 9 ॥
hk transliteration by Sanscript