D. linearis "Michigan"

[picol]

Yes you are right Hcarlton, i didn't thought to the pollution. Maybe a neutral substrate is enough.
@FrankenSnyder, could work crushed egg shells instead of seashells?

[FrankenSnyder]

Bone meal would be more fun I have been growing Alpine D. anglica (var. pusilla) and my Super Sundew on neutral to slightly alkaline gravel including decomposed granite. Looks good topped with live sphagnum. More info:
D. anglica Alpine x HI

[FrankenSnyder]

I did a simple test: Poured a solution of crushed sea shells into a cup holding a small Super Sundew which was forming a weak flower stalk. After the phosphate dose there was a growth spurt and the flower opened perfectly with much pollen. I wish all you growing linearis good luck as it is a very interesting plant and fairly rare.