in Thoreau’s Journal:

As for the saxifrage, when I had given it up for to-day, having, after a long search in the warmest clefts and recesses, found only three or four buds which showed some white, I at length, on a still warmer shelf, found one flower partly expanded, and its common peduncle had shot up an inch. These few earliest flowers in these situations have the same sort of interest with the arctic flora, for they are remote and unobserved and often surrounded with snow, and most have not begun to think of flowers yet.

in Thoreau’s Journal:  

I am surprised to find Walden completely open. When did it open? According to all accounts, it must have been between the 6th and 9th. Fair Haven must have opened entirely the 5th or 6th, and Walden very nearly at the same time. This proves how steadily it has been melting, notwithstanding the severe cold of the last half of March; i. e., it is less affected by transient heat or cold than most ponds.

The flowers have blossomed very suddenly this year as soon as the long cold spell was over, and almost all together.

in Thoreau’s Journal:

As to which are the earliest flowers, it depends on the character of the season, and ground bare or not, meadows wet or dry, etc., etc., also on the variety of soils and localities within your reach.

in Thoreau’s Journal:

If you make the least correct observation of nature this year, you will have occasion to repeat it with illustrations the next, and the season and life itself is prolonged.

in Thoreau’s Journal:

The aspect of April waters, smooth and commonly high, before many flowers (none yet) or any leafing while the landscape is still russet, and frogs are just awakening, is peculiar.

in Thoreau’s Journal:

Begin to look off the hills & see the landscape again through a slight haze, with warm wind on the cheek.

in Thoreau’s Journal:

The atmosphere of morning gives a healthy hue to our prospects.

in Thoreau’s Journal:

When the sun shines unobstructedly, the landscape is full of light, for it is reflected from the withered fawn coloured grass—as it cannot be from the green grass of summer.

in Thoreau’s Journal:

It is evident that it depends on the character of the season whether this flower or that is the most forward; whether there is more or less snow or cold or rain, etc…..

It will take you half a lifetime to find the earliest flower.

in Thoreau’s Journal:

With this flower, so much more flowerlike or noticeable than any yet—begins a new era in the flower season.