Tall, grass-like seedlings with long roots in your Drosera 'King Marston' pot are common reed grass (Phragmites)—a frequent weed in carnivorous plant collections. Its seeds contaminate peat and sphagnum easily.
Remove immediately. It's not a carnivorous plant and will outcompete your sundews. No reason to keep it.
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Buying Zebra Grass & Gold Bar Grass Seed: Gold Bar Is Sterile, Zebra on eBay
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Identifying a Mystery Plant from a Historic New Zealand Garden
Planting Zebra Grass: Remove Lawn Grass First for Best Results
Mystery Plant Identification: Round Green Fruit with Pointed Tip
Lantana camara (“Ham and Eggs”): The Colorful, Itchy, Toxic Volunteer
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Pokeweed Seeds: Identification and Propagation
Oxalis: The Purple Shamrock Plant That Folds Its Leaves at Night
Controlling Tall, Thick Grass Patches in a Newly Seeded Area
Annual Curb-Side Dieback in DC: Not a Seed Problem
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