It is now the season of growth.

June 1.

Summer begins now about a week past, with the expanded leaves, the shade and warm weather.

Cultivated fields also are leaving out, i.e. corn and potatoes coming up. Most trees have bloomed and are now forming their fruit. Young berries, too, are forming, and birds are being hatched. 

Dor-bugs and other insects have come forth the first warm evening after showers. 

The birds have now all come and no longer fly in flocks. The hylodes are no longer heard. The bullfrogs begin to trump. 

Thick and extensive fogs in the morning begin. 

Plants are rapidly growing, -- shooting. 

Hoeing corn has commenced. 

The first bloom of the year is over -- It is now the season of growth.

H. D. Thoreau, Journal, June 1, 1853

See June 16, 1860 ("It appears to me that these phenomena occur simultaneously")

Summer begins now with the expanded leaves, the shade and warm weather. See June 4, 1860 ("You may say that now, the leafy season has fairly commenced. , , ,, making already a grateful but thin shade, like a coarse sieve, so open that we see the fluttering of each leaf in its shadow.")

Plants are rapidly growing, -- shooting. See June 1, 1854 ("Within little more than a fortnight the woods, from bare twigs, have become a sea of verdure, and young shoots have contended with one another in the race"); and note to May 26, 1854 ("They have accomplished more than half their year's growth, . . . They are properly called shoots. ")