This month, in a heated propagator you can sow:
(Most propagators on the market are set to approximately 20 deg.C - or slightly warmer, unless they have adjustable thermostats):
For tunnel/greenhouse growing later - Early tomatoes, aubergines, sweet and chilli peppers, calabrese/broccoli, celery, celeriac, physalis (Chinese gooseberries) and dwarf French beans (for very early cropping in pots). Also half-hardy annual flowers like nicotiana, which need a long growing season.
Early sowing in warmth will gain you a couple of weeks in most cases - but bear in mind that all of these will need warmth for some time yet though - After the initial higher temperature germination in a heated propagator, they will then need growing on with a minimum bottom heat of around 50deg.F/10deg.C - in a draught-free space, perhaps on a hotbed or a roll-out heated mat, protecting with fleece if frost is forecast and potting on when necessary to avoid any setbacks, then gradually hardening off and finally planting out in the tunnel as soon as the late winter/early spring crops are cleared from late April/early May onwards.
In more gentle warmth
(At approx 10deg.C - either on a roll out heated mat with adjustable thermostat or in your house, putting out into greenhouse or cold frame after germination when good light will be needed.
For planting out in the tunnel or outdoors under cloches later - you can sow brassicas such as early summer cauliflowers, summer cabbages, red cabbage, early Brussels sprouts and the new varieties of 'summer purple sprouting' broccoli, lettuces, perennial veg. like Welsh onions, globe artichokes and seakale, spinach, spring onions(scallions), early leeks and bulb onions, shallots, early peas, broad beans, kohl rabi, white turnips, land cress, rocket, salad mixes, watercress.
Now is also a good time to sow bee-friendly, fast-growing hardy annuals like limnanthes, calendulas, convulvulus tricolour, borage etc. - to provide early flowers for attracting beneficial insects like hoverflies into the tunnel to help with pest control. Early flowers will also provide a welcome early meal for bees - which are vital for pollination of early flowering polytunnel fruit trees like peaches. Provide the food they need and they'll keep coming back, as bees quickly learn where reliable sources of food are and communicate this knowledge to the rest of their fellow bees, clever things - a mutually beneficial relationship for them and us!
Directly into soil pre-warmed with cloches or in pots/modules in the tunnel without heat
(covering on very cold nights with fleece):
You can sow more hardy crops like broad beans, carrots, 'Ragged Jack' , Black Tuscan and other kales for baby leaves, Ruby chard and 'Bull's Blood' or McGregor's favourite beetroot for beet leaves, pre-sprouted mangetout and early peas, for both pea shoots and podded peas -(pre-sprouting in warmth ensures faster germination which means seeds are less prone to rotting), lettuces, herbs, (not basil yet - it's too cold) mixed leaf salads, oriental mustards and salad mixes, rocket, summer spinach etc. These will all crop before June in the tunnel or greenhouse.
Planting half the modules inside and the other half outside under cloches is a good way to spread cropping times. Other hardy crops like beetroot, kales and chards can also be sown in modules now for planting outside under cloches later. Remember - most seeds won't germinate below a soil temperature of about 45degF or 7degC.
Another tip - lettuce and spinach seeds prefer to be fairly cool for the first 24-48 hours, as higher temperature can trigger dormancy- so don't sow these in too much heat. I always sow them at normal house temperature, there I can also keep an eye on them and uncover as soon as they start to germinate. I then transfer them out to the polytunnel so that they have really good light, protecting at night if frost is forecast.
Small seedlings will also need protecting from frost with fleece if it's very cold. If you can provide these conditions then almost everything but the most tender crops can be sown in suitable modules in mid-late February for planting out under cloches later - but don't grow them on in too much warmth or they will be too soft and 'leggy' as light levels are still relatively low.
Keep an eye out for mice which are very partial to pea and bean seeds and will even dig up and eat the seeds when the plants are already a couple of inches high, as I know to my cost!
All of these things could be germinated anywhere warm and then grown on in very good light on a windowsill if you have room - but do bring them inside the room at night if you close the curtains, or they may get chilled on cold nights. And remember that a south facing window may be too hot even at this time of year. One well known journalist in the west of Ireland told me he puts his tomatoes under his Velux office window in good light after germinating them in the warm - a great idea! I couldn't work out how he'd got them so early when he wrote complaining that my advice on side shooting tomatoes was far too late for his plants - his Pantano Romanesco had already gone completely bonkers by May!! That particular beefsteak variety needs even more severe discipline than most - but the exceptional flavour makes it well worth the extra trouble!
It's much too early yet to sow most melons and cucumbers. These are very fast growing - taking only about 12 weeks from sowing to harvest. The only exception is watermelons - the larger types of which need starting off in mid-late Feb. as they need a long growing season to be successful. The small 'Sugar Baby' will still crop well in a warm polytunnel if sown in March. Watermelons are also very tender, susceptible to even the slightest frost and are actually damaged below 50deg.F/10degC. - so unless you have a heated greenhouse, (and who has in these carbon-conscious days?) they'll be far too big before it's warm enough to plant them out in the tunnel or before their allotted tunnel space is vacant. Potting them on into larger pots and placing on a 'roll out' heated mat to provide bottom warmth is a much more energy efficient option. I find it's best to wait until at least mid March for sowing most of the cucurbitaceae family - they can then grow on quickly without any check. Five years ago I tried sowing the delicious yellow courgette 'Atena' very early as an experiment - sown on 23rd Feb. and grown on in gentle warmth, it was planted into large pots in the west tunnel in early April and was given extra protection with fleece on cold nights. It gave a really early crop in mid May. I now do this every year as it's definitely well worth doing to get some delicious early courgettes!
As soon as the ground is in reasonable condition you can plant Jerusalem Artichokes. If it's still too wet you can plant them in 2 litre pots for planting out in a few weeks. You can also plant shallots, onion sets and garlic either in the ground or again in pots if it's too wet - but you must choose varieties of garlic which are labelled as suitable for spring planting - such as 'Christo'. If you plant 'autumn planting' varieties now they will just produce one single bulb rather that splitting into individual cloves which is what you want. If you have well sprouted seed of any variety of potato you can plant some in large pots or directly into the tunnel soil now. These will need protecting from frost at all times. First early varieties are obviously best as these will bulk up quickly - giving a crop in about 10-12 weeks in late April or early May depending on variety - those grown on in pots from planting to harvest will also be slightly earlier than those planted out in the tunnel borders.
Don't attempt to sow anything outside into cold wet ground yet! If you haven't done so already - get cloches or a polythene cover out onto vegetable beds outside now to dry them out and start them warming it up. If your ground hasn't been covered all winter - it could take weeks to dry out after all the wet weather we've had. Another reason why ground should always be covered in winter - apart from the soil-loss, damage and possible pollution aspect!
I always use a good, well drained, organic peat-free seed compost for all my seed sowing. If you're not using organic peat-free then make sure you use a seed compost - rather than an multi-purpose compost. These may contain far too much fertiliser if not organic which may either inhibit germination of seedlings or even burn and kill emerging roots!
*JUST ONE MORE THING - Always open seed packets with clean dry hands - not 'garden muddy' hands! Most seed will last for ages if kept really dry and cool at all times. I find that a dry cool room is usually far better than most domestic refrigerators which can be too damp. (the exception is celery, carrots and parsnips, which tend to have reduced germination when more than 1 year old) Sow seed little and often - preferably in modules if you have room - it's far more time and cost-effective than sowing in rows and transplanting. It also avoids wasting seeds as it avoids root disturbance and possible damage or setback when 'pricking out' from seed trays - or from slugs eating vulnerable tiny seedlings.
P.S. IGNORE THE SEED PACKET'S ADVICE WHICH TELL YOU TO SOW THE SEEDS ALL AT ONCE IN A ROW OR IN A SEED TRAY as this can waste seed - REMEMBER - THEY WANT YOU TO BUY MORE!
Happy seed sowing everyone! May all your seeds be successful!
(Thank you so much to all the people who have taken the time to write and thank me for my work - or thanked me on Twitter. I really enjoy sharing my original ideas and 40 years experience of growing and cooking my own organic food with you. It's most satisfying and naturally also very complimentary if others find "inspiration" in my work......But if you do happen to copy any of my material, or repeat it in any way online - I would appreciate it very much if you would please mention that it originally came from me, as it's the result of many years of hard work. Thank you.)