Spring habit - Harumakisei (English spelling)

Japanese: 春播性 - はるまきせい（英語表記）spring habit

This is a growth habit seen in some varieties of wheat, rapeseed, radish, etc., in which flower buds form, flower, and fruit even if they are not exposed to low temperatures when they are young. Conversely, if they are not exposed to low temperatures at that time, the stems and leaves continue to grow luxuriantly, and the formation of flower buds, flowering, and fruiting are delayed. This growth habit is called the winter habit. Varieties with the former growth habit are called spring sown varieties, and those with the latter are called autumn sown varieties. The difference between spring sown varieties and autumn sown varieties is actually a matter of degree, and the seeds of each variety are sown from autumn to spring, and for convenience they are divided into seven classes based on the changes in the timing of heading and bolting, and each class is displayed as the degree of spring sown variety (or autumn sown variety).

Source: Heibonsha World Encyclopedia, 2nd Edition Information

Japanese:

ムギ類，ナタネ，ダイコンなどの一部の品種にみられるもので，幼植物のときに低温にあわなくても，花芽を形成し開花，結実するような発育習性をいう。その逆にその時代に低温にあわないと，いつまでも茎葉ばかりが繁茂し，花芽の形成や開花，結実が遅れるような発育習性を秋まき性winter habitという。前者のような発育習性をもつ品種を春まき型，後者の品種を秋まき型と呼ぶ。春まき型であるか秋まき型であるかの差は実際上は程度の問題で，秋から春にかけて各品種の種子をまき，出穂，抽だいの時期の変化などを参考にして便宜的に七つの階級に分け，それぞれ各品種の春まき性(あるいは秋まき性)程度として表示している。

出典　株式会社平凡社世界大百科事典第２版について　情報

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