Tomato plants

Nathansgrandad

When to sow tomato seeds to grow on in a cold  greenhouse and what soil mix to use   greater Manchester area 

Obelixx

Tomato seeds need warmth to germinate and then grow on so you will either need a heated propagator for the seed trays or else wait till March or April when it may start to get warm enough in your greenhouse.

Start them off in good quality compost for seeds and cuttings and then prick them out into individual pots when big enough using John Innes no 2 compost and ending with  John Innes no 3 compost.   John Innes is loam based which gives good drainage and the numbers refer to the nutrient levels.  You'll need to keep them watered, but not drowning, as they grow and they'll need feeding with a comfrey solution or commercial tomato feed when they start flowering.

Have a look at this info from the RHS before you start - https://www.rhs.org.uk/advice/grow-your-own/vegetables/tomatoes