The best sight seeing ume viewing spot in Kamakura is Zuisenji temple. In fact there are many temples in around Kamaura area, nealy 120 ume trees ,which is the largest number, will bloom. The best season is mid March.
Winter jusmine, white plums and red plums will bloom in the area of temple.
You will also feel Zuisenji is a beautiful Zen temple with in the back of a narrow valley and surrounded by wooded hills.
【Zuisenji temple】
Address: 710 Nikaido, Kamakura
Hour: 9:00~17:00
Closed: Open everyday
http://kamakura-guide.jp/zuisenji-ume