PLEASE NOTE: Since plants are often sourced from the garden to order, sizes do vary a little, depending on how they come out of the ground, but I always endeavour to give a little more rather than less! They are sometimes shipped bare-rooted, but will approximate the size specified (e.g. a 9cm pot).

Centaurea macrocephala
Globe Knapweed
Currently unavailable
Type/Hardiness Herbaceous, Perennial, Hardy
Flowering period June-September
Height 3-4ft/1-1.25m
Light preference Sun/part shade
Soil preference Any, moist, well-drained
Sowing time/depth Spring or Autumn, 0.75in/2cm
Visitors to the garden often fall in love with this plant, which forms a large clump and has large spherical buds opening to clear yellow flowers surrounded by unusual, papery brown bracts. The mature seed heads are a natural 'barometer', opening and closing according to humidity.
Sowing and/or growing instructions
Can be direct sown after danger of frost has passed, but it might be safer to sow in pots under glass Feb-May or Sept-Nov. Darkness and good moisture is needed for germination (21-30days), and the plants do not like disturbance, so sow, 0.75in/2cm deep in well watered compost in modules. Place in propagator or plastic bag at 70F/20C. Keep moist. Grow on in good light. Carefully transplant into larger pots and plant out strong plants 2ft apart, preferably on a dull day, watering in well.
Latest additions to Norfolk Cottage Garden Seeds & Plants
Origanum vulgare Astrantia major 'Roma' Nicotiana sylvestris Lupinus x russellii 'Chandelier' Cyperus esculentus
Origanum vulgare Astrantia major 'Roma' Nicotiana sylvestris Lupinus x russellii 'Chandelier' Cyperus esculentus  
Norfolk Cottage Garden - Free Seeds!
Choose a packet of seeds from the three varieties below and it will be added to your order absolutely FREE!
 Nicotiana langsdorfii
Nicotiana 'Lime Green'
 Agrostis nebulosa
Agrostis nebulosa
 Nicandra physalodes
Nicandra physalodes Shoo-fly plant

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