Oirase Nature Calendar

Calendar of Fauna and Flora in Oirase

Calendar of Fauna and Flora
in Oirase

Color coding:

Blossoms are in full bloom
=Herbaceous plants
=Woody plants

 

In Early April

・Anemone (Anemone pseudoaltaica)
・Bakko Willow (Salix bakko)
・Sporophytes of Apple Moss (Bartramia pomiformis) are in full bloom.

In Mid-April

・Otome-engosaku (Corydalis fukuharae)
・Honeysuckle (Lonicera strophiophora)
・Katsura tree (Cerciphyllum japonicum)

・Melting snow and ice increases the volume of water in streams and falls.

In Late April

・Early Spiketail (Stachyurus praecox)
・Fullmoon Maple (Acer japonicum)

・Summer birds chirp: Narcissus Flycatcher (Ficedula narcissina), blue-and-white flycatcher (Cyanoptila cyanomelana), etc.
・Snow on the nature trail starts to melt, and sprouting begins in the lower reaches.

 

 

In Early May

・Soft Windflower (Anemone flaccida)
・Trillium Smallii (Trillium tschonoskii )

・Scarlet Leaved Viburnum (Viburnum furcatum)
・Spicebush (Lindera umbellata)

・Sporophytes of Snake Liverwort (Conocephalum conicum) are in full bloom.

In Mid-May

・Viola Kusanoana (V. kusanoana )
・Jack in the Pulpit (Arisaema serratum)

・Murasaki-yashio (Rhododendron albrechtii)
・Fresh greens are in bloom.

In late May

・Suda-yakushu (Tiarella polyphylla)
・Kurumaba-so (Asperula odorata)
・Yama-tsutsuji (Rhododendron kaempferi),
・Giant Dogwood (Cornus controversa)
・Aodamo (Fraxinus lanuginosa f. serrata)

・Ezo-haruzemi (Terpnosia nigricosta) actively chirps.

 

 

 In Early June

・Oba-mizo-hozuki (Mimulus sessilifolius)
・Miyama-karamatsu (Thalictrum tuberiferum)

・Japanese Horse Chestnut (Aesculus turbinat)
・Weigela Hortensis (Japanese weigela)
・Japanese Wisteria (Wisteria floribunda)

・Ruddy Kingfisher (Halcyon coromanda) actively chirps.

 In Mid-June

・Ginryo-so (Monotropastrum humile)
・Yaguruma-so(Rodgersia podophylla

・Hinano-higasa (Rkicenella fibula) mushrooms grow on a mossy bridge railing.
・Forest green tree frogs (Rhacophorus arboreus) lay eggs.

 In Late June

・Tatsunami-so (Scutellaria)
・Saihai-ran (Cremastra appendiculata var. variabilis)

・Sporophytes of ripe Plagiomnium Acutum are in full bloom.
・Fresh green becomes deep green.

 

 

In Early July

・Oni-shimotsuke (Filipendula camtschatica)
・Amanyu (Angelica edulis)
・Oni-no-yagara (Gastrodia elata)
・Tea-of-heaven (Hydrangea serrata)
・Climbing Hydrangea (Hydrangea petiolaris)

In Mid-July

・Daikon-so (Geum japonicum)
・Goats-beard (Aruncus dioicus)
・Water Crowfoot (Ranunculus nipponicus) (at Makadoiwa)

・Fishing season for red salmon opens in Lake Towada.

In Late April

・Giant Lily (Cardiocrinum cordatum)
・Toriashi-shoma (Astilbe odontophylla)

・Noriutsugi (Hydrangea paniculata)

・The sori of certain ferns start to ripen.

 

 

In Early August

・Panicled Lady Bells (Adenophora remotiflora)
・Yabu-hagi (Hylodesmum podocarpum subsp. oxyphyllum var. mandshuricum
・Kuruma-yuri (Lilium medeoloides)
・Yellow Balsam (Impatiens noli-tangere)
・Jewelweed (Impatients textori )

・Large Brown Cicada (Graptopsaltria nigrofuscata) and Robust Cicada (Oncotympana maculaticollis) chirp.

In Mid-August

・Toad Lily (Tricyrtis affinis)
・Mizuhiki (Persicaria filiformis)
・Nobuki (Adencaulon himalaicum)
・Tamabuki (Parasenecio farfarifolius)

・It gets gradually cooler as autumn approaches.

In Late August

・Akebono-shusu-ran (Goodyera foliosa var. laevis)
・Monkshood (Aconite) (Aconitum japonicum)

・Japanese Popular (Populus maximowiczii ) disperses Ryujyo.
(Ryujyo: The seeds with puffy white hair, which float in the air in this season like dandelion fluffs.)
・Mushrooms sprout all over.


 

 

 In Early September

・Sarashina-shoma (Cimicifuga simplex)
・Kin-mizuhiki (Agrimonia pilosa var. japonica)
・Oakino-kirin-so (Solidago virgaaurea subsp. gigantea)

・Sporophores of certain mosses begin to swell.

In Mid-September

・Indian Pipe (Monotropa uniflora)
・Red berries of Okamenoki (Viburnum furcatum)
・Nuts of Japanese Horse Chestnut (Aesculus turbinat) start to fall.

 In Late September

・Red berries of Jack in the Pulpit (Arisaema serratum)
・Red berries of Korean Sindletree (Euonymus oxyphyllus)

・Berries of Crimson Glory Vine (Vitis coignetiae) and Bower Actinidia (hardy kiwi)(Actinidia arguta) ripen.

 

 

In Early October

・Daimonji-so (Saxifraga fortune)
・Autumnal leaves are at their best in the Hakkoda Mountain.
・Landlocked Masu salmon (cherry trout) start to spawn.

In Mid-October

・Colored leaves around Lake Towada are at their best.
・The sweet smell of the Katsura Tree (Cerciphyllum japonicum) spreads through the forest.
・Whitespotted Chars (Salvelinus leucomaenis) start to spawn.

In Late October

・Colored leaves in Oirase are at their peak.
・Sporophores of some mosses begin to ripen.
・Sporophores of Common Puff Ball (Morganella pyriformis) begin to ripen.

 

 

In Early November

・Red berries of Komayumi (Euonymus alatus f. ciliatodentatus), Japanese Bittersweet (Celastrus orbiculatus)
・Purple berries of Japanese Beautyberry (Callicarpa japonica)
・The forest in late autumn glows with colorful maple leaves.

In Mid-November

・The first snow of the season falls on the remaining colored leaves.
・Water birds fly into Lake Towada.
・The volume of water in the stream falls by water gate control.

In Late November

・Osyaguji-dennda (Polypodium fauriei) on trees appears bright green.
・Mistletoe (Viscum album) is prominent in the forest amongst fallen leaves.
・The greenery of Himeaoki (Aucuba japonica var. borealis) and other trees on the forest floor is outstanding.


 

 

 In Early December

・Subtle icicles are seen at Makado-iwa Rock.
・A mixed flock of Tits (Parus) and Woodpeckers (Picidae) are easily observed.

In Mid-December

・Winter birds can be seen in the forest, including Thrush (Turdus eunomus), Eurasian Siskin (Carduelis spinus), Waxwings (Bombycilla japonica), etc.
・Ice pillars and icefalls gradually grow.

 In Late December

・The number of Whooper Swans (Cygnus cygnus) increases at Lake Towada.
・Japanese Martens (Martes melampus meiampus) and Japanese Hares (Lepus brachyurus) are visible in their white winter furs. 
・Snowfall increases in volume and the scene turns into a winter-like, snowy landscape.

 

 

In Early January

・Footprints of animals such as the Japanese Serow (Capricornis crispus) and Japanese Marten (Martes melampus meiampus) can be seen in the snow.

In Mid-April

・Brown Dippers (Cinclus pallasii) become active and chirp.

In Late April

Frozen lake water spray can be seen.

 

 

In Early February

・Ice pillars and icefalls become enhanced with bluish tints.

In Mid-February

・The courtship display of the Mountain Hawk Eagle (Spizaetus nipalensis) begins.

In Late February

・Winter sprouts on trees start to grow.

 

 

 In Early March

・Frequent snow occurs due to Yamase (strong seasonal winds from the north-west).

 In Mid-March

・Stonefly (plecopteran), Non-Biting Midges (Chironomidae), and so on are vigorously active in the snow.

 In Late March

・Giant Butterbur (Petasites japonicus)
・Witch Hazel (Hamamelis japonica)

・Wren (Troglodytes troglodytes) and Wood Nuthatch (Sitta europaea) chirp.