White Pine Growth Seasons in Wisconsin: Spring + Summer

When Do White Pines Grow in North Central Wisconsin?

White pines (Pinus strobus) are gymnosperms with two potential growth flushes per year:

• Primary flush: Spring (approx. April 1 – late June). Candle elongation → needle expansion.
• Secondary flush (Lammas growth): Mid–late summer, only if moisture, temperature, and nutrients allow. Often absent in harsh climates.

Wisconsin Reality

In north central WI, the growing season is roughly April 1 – October 20. Winter dormancy is complete. Minimal to no growth occurs Nov–March. A mild winter might allow slight cambial activity, but no shoot elongation.

Management Implications

• Fertilize early spring (before flush) if needed.
• Water during dry spells in June–August to support potential second flush.
• Prune only in winter (dormant) or after spring flush hardens.
• Shear for Christmas tree shape in late June–July after candles elongate.

10,000 trees is a serious operation. Consider soil testing blocks for targeted fertilization.