Medieval plant dyes (and modern)

As long as you have red, yellow and blue you can mix and match to make almost any colour. Some of these dye plants are more resistant to fading in sunlight or getting washed out of the fibre than others.

Any plant name that is in bold is a perennial (or biennial).

Red - 

Medieval European- Madder (Rubia tinctoria), Lady's Bedstraw/Cleavers (Galium verum)

Other- Amaranth (Hopi red dye), Dyer's Alkanet, Henna (Lawsonia inermis) (shrub), Joe Pye Weed, Dyer's Woodruff (Asperula tinctoria), Brazilwood (tree)

Orange - 

Medieval European- any yellow + Madder, or just Madder itself

Other- Dyer's Coreopsis (Coreopsis tinctoria), Orange Cosmos, Black Eyed Susan (Rudbeckia fulgida 'Goldstrum') (edges into dull yellow)

Plant-based rennets for cheese

The Medieval Cheese Blog is an amazing resource. I'm planning on trying a couple of these suggestions for making cheese- Plant-based cheese rennets

The most accessible plants mentioned are nettle, thistle, cardoon, sorrel and lady's bedstraw (that's a very multi-purpose plant!). The other option she mentions is the sap of a fig tree. While it's possible to grow those in Ontario, unless you live in zone 7 it's a serious pain to try and keep them.

I've harvested a few early sorrel leaves from the garden, so I'll see how it turns out.