Some of this in your greenhouse and you can divide your friends into two groups. Either, Coriander is delicious adding aroma to salads and spicy dishes. Or, Coriander has a strange mousey odour like a kennel of damp dogs. There’s no in-between position. Apparently this is genetic, not something we choose. So be warned, if having friends to a meal do not heavily load dishes unless you’ve checked. Mind you small amounts may be over-looked as although distaste is definite it’s often only weak. If you love the smell stand a tub by the door as rubbing past can fill the greenhouse. If you don’t like but must grow for your partner or whatever this can stand outdoors, indeed it’s sometimes naturalised though originally from Asia.
A minor point, take care where seed comes from, Coriander is popular worldwide in one form or another, and varies. Slightly different strains have been selected in the many cuisines using this herb. So if you can then get seed from the country originating the dishes you want to make.
AND, even more importantly for foliage be careful to get seed for foliage (which most commercial seed is). Plants from Coriander Seed from the jar in the herb rack or similar will be strains selected for seed so will ‘bolt’. This seed is even more common and in far more dishes than the foliage. Once crushed it imparts a delicious spicy citrus like flavour essential for most cuisines.
Once you have ‘correct’ seed it’s simple. Coriandrum sativum is an annual Umbellifera closely related to Parsley, Carrot, Chervil. Sow thickly direct in a modest pot or tray for foliage, or larger deeper tub and wider spaced for a seed crop. Very easy of culture just feed and water, the usual culprits may nibble holes but few problems occur. When grown for foliage the plants can be cut back several times then discarded to be replaced with another batch almost year-round. For seed sow in spring as the plants need to grow through the whole season, these get taller and may need a cane for support. The many heads of white flowers attractive to insects ripen to spherical seeds in late summer to be collected and dried for use.