Bog Garden pH Management and Venus Flytrap Winter Strategy in Canada

pH monitoring is unnecessary with correct ingredients: peat/sphagnum mixes are naturally acidic. Peat releases tannic acid; commercial potting soils add lime to neutralize—avoid these. All listed plants (S. purpurea, 'Daina's Delight', 'Scarlet Belle', VFT, D. rotundifolia) thrive in standard CP mixes.

Your VFT appears typical or 'King Henry'. For Canadian winters: either mulch heavily in the bog garden or overwinter potted in a cool window. The ICPS Ontario bog garden guide is an excellent regional resource.