Good Pulmonaria winter care rests on three core tasks. Mulch the crown, tidy any decayed leaves, and check your drainage before the ground freezes. Get these three steps right and your lungwort will bounce back with strong blooms in spring.
I lost one prized clump of 'Roy Davidson' to soggy winter clay back in 2019. The crown turned to mush by March that year despite a hard mulch layer. After I dug in grit and coarse sand to improve drainage the next fall, zero rot showed up the following spring.
Overwintering lungwort works best when you grasp why crowns fail in cold months. The top growth handles freezing fine without much help from you. The real risk comes from the crown sitting in cold wet soil for weeks at a time. Wet roots plus freeze cycles cause rot fast.
Think of the crown as the heart of the plant where roots meet the base of leaves. This tissue holds next year's buds and stored food. Cold dry soil keeps it safe through any winter. Cold wet soil can kill it within a few weeks of standing water around the base.
Mulch is your single most useful tool for winter pulmonaria protection in any climate zone. Apply 2 inches (5 cm) of mulch around the crown after the first hard frost. Shredded leaves work best for the job and break down by spring to feed the soil naturally.
Pine bark, straw, and finely shredded hardwood also work well as mulch options. Skip heavy whole leaves like maple, which mat down and trap too much moisture. Keep mulch off the crown itself by leaving a small bare ring of soil right around the base of the plant.
With good mulch, lungwort handles cold down to -30°F (-34°C) across USDA zones 3-8. Without mulch in those zones, the plant still lives most years but loses some buds. Mulch matters more in zones 3 and 4 where the deep cold sets in for months.
Light cleanup of decayed leaves stops fungus from taking hold over the cold months. Pluck any black or slimy leaves from the crown in mid-fall. Leave green and healthy foliage in place since it shields the crown from freeze-thaw stress. A quick five-minute pass per clump does the job.
Lungwort cold weather care also means smart drainage moves before fall ends. Test your bed by digging a small hole and filling it with water. If the water sits more than two hours without draining, you have a problem. Heavy clay soils need amendment before any plant goes in.
Mix a shovel of grit or coarse sand into the soil around each clump in late fall. Add a handful of compost too for slow soil structure gains. This work makes a huge difference by the next spring and prevents that wet-crown trouble.
For preparing pulmonaria for winter, follow this short checklist as fall winds down. Clear any decayed leaves first to limit fungus through the cold months. Add 2 inches (5 cm) of mulch around but not on top of the crown. Check drainage and amend heavy soils with grit.
Mark your crown locations with small stakes or labels in zones 3 through 5. Cold zone leaves vanish fully by November in many gardens. Without markers, you risk digging into a sleeping crown by mistake during spring chores. A painted stick or plastic tag works fine for the job.
Skip foot traffic across frozen beds where lungwort sleeps below the soil. Compacted earth squeezes the crown and damages tender buds you cannot see. Plot a clear path around your shade beds to keep visitors and pets off the planted zones all winter long.
Skip late fall fertilizer pushes since fresh growth right before frost will burn off and waste plant energy. Hold any feed until spring when growth resumes. Water deeply once if your fall stays bone dry, but stop watering by the first hard frost.
When I first started growing lungwort in my zone 5 yard, I worried too much about top growth. In my experience now, the crown is what truly matters for winter health. Focus your care below the soil line and your plants will reward you with bright spring blooms year after year.
Read the full article: Pulmonaria Plant: Complete Grower's Guide
