They grow best in hot summer heat, so I need to plant them early in spring.

它们在炎热的夏天长得最好，所以我需要在早春时节种上。

youdao

Spring set in early this year.

今年交春早。

《新英汉大辞典》

And when game moved out of the lowlands in early spring, the expedition decided to return east rather than face possible starvation.

然后，猎物在早春迁徙出低地时，探险队决定返回东部，以免遇到可能出现的饥饿问题。

youdao

The tree sap in early spring; the new-born green leaf, soft and fresh as skin;

VOA: special.2010.02.27

This is how the poem begins: When lilacs last in the dooryard bloomed, And the great star early drooped in the western sky in the night, I mourned, and yet shall mourn with ever-returning spring.

VOA: special.2009.04.12

Hafner tried to make changes early in spring, and then jettisoned them in favor of a stripped-down approach.

WSJ: Don't Blame the Yankees' Replacements

" Manager Terry Collins agreed, saying, "Watching him throughout the spring, early in the spring, we could see some things were wrong.

WSJ: Johan Santana: Another Tear for the Mets

Flowering was early in the spring of 2011, which meant that although the harvest date was early in some vineyards the earliest since the end of the 19th century the grapes enjoyed a long hang time on the vine.

WSJ: Will Lyons on Wine: The Joyful Restraint of 2011 Burgundy