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Note: Germination instructions are not on seed packets, follow the instructions below for starting seed.
Milk thistle is propagated by seed. Freshly collected seed will germinate only at cool temperatures, but seed stored dry for five months will germinate at warm temperatures.
The seed can be sown directly when the soil temperature is still cool. Early sowing is advisable because the plant needs four to five months to grow and mature. Optimum germination has been reported under conditions of 2-15°C at night (air temperature), alternated with daytime temperatures of 10-30°C.