Guide to growing Milk Thistle - Silybum
Members of the Silybum genus are hardy annuals or biennials that reach a height of about 1.2M.
They bloom in the summer when they carry purple flowers reminiscent of thistles.
Some common names for Silybum include Milk Thistle, Lady's Thistle, Holy thistle and Our Lady's Milk Thistle.
How to grow Milk Thistle
When starting off outdoors the seeds of Silybum species such as milk thistle should be sown at a depth of 3mm either in early summer ( Silybum biennials) or just after the last frost of spring (annual Silybum). Milk thistles can grow in either sunny or lightly shaded areas of the garden and the soil type is not to important.
If starting Milk thistle off indoors then do so about two months before they are due to be transplanted outdoors (transplant biennials in late summer; annuals following the last frost of spring). It takes about three weeks for milk thistle to germinate at a temperature of 12 to 15 degrees centigrade.
Caring for Milk Thistle
It is easy to look after Milk thistle and other members of the Silybum genus; They can tolerate dry ands wet soils, so just let them be. However they may become weedy, so it is best to deadhead the flowers before they set seed, and to remove any unwanted thistle plants.