Soil & potting mix
Best soil for Lungwort 'Bertram Anderson' (Pulmonaria longifolia)
Also called Bertram Anderson Lungwort, Long-Leaved Lungwort, Spotted Dog.
More about lungwort 'bertram anderson'
About Lungwort 'Bertram Anderson'
Pulmonaria longifolia · also called Bertram Anderson Lungwort, Long-Leaved Lungwort · flowering
Lungwort 'Bertram Anderson' is a beautiful shade perennial with narrow, intensely silver-spotted leaves and deep violet-blue flowers in early spring. Neater and more drought-tolerant than some pulmonarias, it excels as ground cover under trees. Moist, humus-rich shade suits it best. Pet-safe according to ASPCA.
Preferred mix: Humus-rich, moisture-retentive loam
Watch for — Summer dormancy: Extended drought may trigger premature dormancy; maintain soil moisture to keep leaves looking good through summer.
Why lungwort 'bertram anderson' needs this mix
Lungwort 'Bertram Anderson' hates drying out, so it wants a mix that stays evenly moist — but it still needs perlite so "moist" never tips into "waterlogged".
- Lungwort 'Bertram Anderson' comes from damp, shaded forest floors and has fine roots that scorch and brown the moment the rootball dries — the mix has to hold a steady reserve.
- Coir and compost give that reserve, while perlite keeps enough air that the constantly-moist mix does not turn anaerobic.
- Even moisture also keeps its thin leaves from crisping at the edges, which is this plant’s most visible stress signal.
For the full picture on what makes up a good mix, see our guide to the main types of soil and potting media — it explains why each ingredient above behaves the way it does.
What goes wrong with the wrong mix
The wrong soil is one of the most common reasons lungwort 'bertram anderson' struggles, and the damage often shows up weeks later as a watering problem. For this species specifically:
- A free-draining, gritty mix dries too fast for lungwort 'bertram anderson' — you get crispy brown edges and frond or leaf drop within days of one missed watering.
- A pure, airless peat mix swings the other way: it holds water but suffocates the fine roots and rots the crown.
- Letting the mix dry to the point it shrinks from the pot is very hard to re-wet evenly and stresses the plant badly.
Using a sharp, fast-draining "houseplant" or cactus-leaning mix that lets lungwort 'bertram anderson' dry out. It needs a moisture-retentive but still airy blend.
pH — does it matter for lungwort 'bertram anderson'?
Lungwort 'Bertram Anderson' prefers a slightly acidic mix (around pH 5.5-6.5); a peat-free compost-and-coir blend sits there naturally, so routine pH testing is unnecessary.
If you want to check or adjust it, the soil pH guide walks through testing and the safe ways to nudge a mix more acidic or more alkaline.
DIY mix vs a bagged one
A good peat-free houseplant compost works for lungwort 'bertram anderson' straight from the bag if you mix in some perlite for air. The DIY ratio above gives a more reliable moisture-to-air balance.
Drainage and the pot
Use a pot with a drainage hole but a less-porous material (plastic or glazed) so it does not dry too fast. Bottom-watering keeps the mix evenly moist without sogging the crown.
Peat-free mixes slump and compact as they hold moisture, so refresh lungwort 'bertram anderson''s mix every 12-18 months to keep air in the rootball even if the pot size is unchanged. When the time comes, our repotting guide for lungwort 'bertram anderson' covers the timing and technique step by step.
Lungwort 'Bertram Anderson' soil — frequently asked questions
What is the best soil mix for lungwort 'bertram anderson'?
3 parts peat-free houseplant compost : 1 part coco coir : 1 part perlite. Lungwort 'Bertram Anderson' comes from damp, shaded forest floors and has fine roots that scorch and brown the moment the rootball dries — the mix has to hold a steady reserve.
Can I use normal potting soil for lungwort 'bertram anderson'?
A free-draining, gritty mix dries too fast for lungwort 'bertram anderson' — you get crispy brown edges and frond or leaf drop within days of one missed watering. A good peat-free houseplant compost works for lungwort 'bertram anderson' straight from the bag if you mix in some perlite for air. The DIY ratio above gives a more reliable moisture-to-air balance.
Does lungwort 'bertram anderson' need a special pH?
Lungwort 'Bertram Anderson' prefers a slightly acidic mix (around pH 5.5-6.5); a peat-free compost-and-coir blend sits there naturally, so routine pH testing is unnecessary.
Should I buy a bagged mix or make my own for lungwort 'bertram anderson'?
A good peat-free houseplant compost works for lungwort 'bertram anderson' straight from the bag if you mix in some perlite for air. The DIY ratio above gives a more reliable moisture-to-air balance.
How often should I refresh the soil for lungwort 'bertram anderson'?
Peat-free mixes slump and compact as they hold moisture, so refresh lungwort 'bertram anderson''s mix every 12-18 months to keep air in the rootball even if the pot size is unchanged. Use a pot with a drainage hole but a less-porous material (plastic or glazed) so it does not dry too fast. Bottom-watering keeps the mix evenly moist without sogging the crown.
Keep reading
- Lungwort 'Bertram Anderson' care — the full brief (light, water, humidity, problems, pet safety)
- How often to water lungwort 'bertram anderson' — the schedule the mix feeds into
- Repotting lungwort 'bertram anderson' — when and how to refresh the mix
- Soil pH guide — test it and adjust it safely
- Underwatered plant — signs and how to rehydrate it
- Why is my plant wilting? Wet vs dry diagnosis
- Should I water my plant? The simple check first
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