february

According to lunar calendar, 5 II is beginning of spring, but it is still freezing. So this contrast is what makes February special.
It's also the month of 節分（せつぶん）, where evil demons are cast out and luck is invited in - similar to Calandamarz and heaps of other spring rites.
Poetic name is 如月（きさらぎ）, literally like the moon, but also bears the meaning of rebirth or regeneration. There's a poem about the plum blossoms struggling through the winter cold that Soshitsu XV finds fitting to this season; and of course 利休's favourite 侘び poem about the grasses.
利休 Memorial Day on 28 II, but it is usually celebrated in March

紅炉上一点雪　（こう　ろ　じょう　いってん　の　ゆき）. One snowflake on the hot embers. Meaning that on the hot embers of the Zen mind, all delusions will disappear without trace like a snowflake. 紅炉 seems also be good for a 茶杓.

梅（うめ or ばい）, of course
Mittwer sais Sarishu and camellia Container: Korean glazed pottery with animal-shaped ears

Sen sais Red camellia in a gourd-shaped low Seto-ware container hung on the wall in the tokonoma.