March gardening concepts: indicators of spring (month 4)


You realize spring is on its approach as daylight lengthen, temperatures heat and whereas the snowdrops (Galanthus) and early Crocus tomassianus are ending, daffodils (Narcissus) and the wave of different spring bulbs are hitting their stride.

Prepared, regular, wait… then sow!

The unique propagation station – in our previous bay window, you don’t want a giant space to develop loads
  • Start sowing seeds indoors: there’s no escaping that March and April are an important months for sowing seeds. Whereas it’s necessary to sow progressively by means of the remainder of summer time for steady vegetable crops and annual flowers, early spring is the engine month. However out of doors temperatures can nonetheless be unpredictable and it’s necessary to keep watch over climate forecasts.
  • When to sow: there’s normally some extent in March, even when it’s proper on the finish, when you may really feel winter has damaged. There’ll nonetheless be chilly days and nights to return, however you may really feel the worst is out of the best way as a result of there may be an prolonged sunny spell and evening temperatures turn out to be hotter.
  • Use a heated propagator or warmth mat: early in spring it’s at all times value giving seeds an additional warmth enhance from beneath to get them began. Until they’re significantly hardy, peas and broad beans gained’t want it.
  • Keep away from damping off: backside warmth additionally helps hold the compost heat to assist scale back damping off, a fungal an infection in soils that kills seedling stems on the base. Good air circulation I discover is totally vital to avoiding damping off, I haven’t had it since ensuring air strikes barely round seedlings with a slight breeze or draft. Sturdy daylight can be necessary to get them off to a great begin.
  • Know your evening temperatures: I by no means actually focus an excessive amount of on daytime temperatures, consistency in evening temperatures is what I’m in search of. When nights are persistently above 5C I do know we’re into the house straight of the rising season. Summer season comes when evening temperatures are above 10C.


Daucus carota ‘Dara’ on my previous allotment – a straightforward and delightful perennial.
  • Flowers to sow exterior: towards the top of the month I’ll sow hardy annuals and perennials direct exterior or in pots resembling: Nasturtium (Tropaeolum), Ammi spp., cornflower (Centaurea cyanus), opium poppies (Papaver somnierum) and Daucus carota.
  • Flowers to sow inside: additionally later within the month, towards the top when mild ranges are stronger and climate hotter, I’m going to be sowing Dahlia seeds, Nicotiana, Cosmos, Zinnia and different much less hardy annuals in our polytunnel and on windowsills. Candy pea seeds might be sown in spring in addition to autumn, they merely flower a tiny bit later.
  • Take cuttings of dahlias: cuttings of dahlias are simple and the normal approach is to begin their tubers inside in pots of compost round February, maintaining the tops simply above the compost for shoots to be seen. By March shoots will begin forming and after they’re about 10-15cm lengthy with a few units of leaves, lower them from the tuber. Do that by taking a tiny piece of the tuber too because the reducing’s base. This can type roots rapidly. Bury the stem to only underneath the decrease leaves in compost in a small pot with just a few different cuttings, then develop on in a sunny spot with base warmth.
  • Weed round present vegetation rigorously: this month is the final finest probability to do that at the beginning begins rising quickly.
  • Add a lightweight mulch of compost or well-rotted manure: in case you didn’t in autumn, add 2-3cm of natural matter round wealthy soil loving perennials, resembling dahlias and cannas.
  • Divide snowdrops: after flowering, divide clumps of snowdrop bulbs whereas nonetheless inexperienced and unfold them round to extend numbers in years to return. Repeat yearly for that dream snowdrop carpet!
  • Plant summer time bulbs: lilies, agapanthus, gladioli, crocosmia and autumn flowering nerines can exit later this month.
  • Take away completed spring bulb flowers: lower off flowers of tulips and daffodils when their flowers wither to maintain vitality within the bulb and never in forming seeds – go away stems. This can assist with flowering subsequent yr. Don’t hassle doing this for smaller flowers like snowdrops and crocus as they’re hold going regardless.
  • Apply nematodes: as soon as soils heat above 5C, which occurs across the time evening temperatures are persistently above 5C, it’s secure to use nematodes to manage varied pests organically. I have a tendency to make use of them to primarily management vine weevil in small gardens the place they could be a drawback in pots and on any plant with a effective, fibrous root system like ferns and heuchera. You combine them right into a watering can following the ratios on the directions, and them pour them across the roots. Repeat this not less than thrice, as soon as in spring, as soon as in summer time and a last time in early autumn. It really works for me. You should utilize them on slugs and garden chafers however I don’t really feel the necessity – I don’t care about excellent lawns personally.


Lettuce seedlings utilizing a develop mild indoors to complement the window mild – to be planted out shortly
  • Create a calendar: plan forward now for what to sow to make sure you don’t overlook a crop. Fairly than write something down, I order my seed packets by month and return to them regularly to see what’s developing that month.
  • Sow salad crops: salad crops resembling lettuce, radish, beetroot and spring onions can all be sown in rows outside when climate warms in March. I additionally like to begin lettuce in indoors in modules (with out backside warmth) to have numerous younger vegetation within the wings to plant out for steady provide, making use of gaps. I do that all through the rising season, although in summer time put the seed trays on a bench exterior
  • Sow root greens: carrots, parsnip and salsify can all be sown direct exterior this month. With parsnips sow in a grid, 20cm between vegetation, that will help you spot their leaves. Many individuals say parsnips don’t do nicely for them however that is seemingly as a result of they’re gradual to germinate, usually hidden amongst weeds. Ultimately they turn out to be extra apparent about 2-3 months later and sowing in grids or rows helps.
  • Sow tender crops indoors: with backside warmth as these vegetation really want heat. Tomatoes, chillies, courgette, cucumber and aubergines. Peas and beetroot are hardy however profit from being sown inside this month. They’ll develop rapidly in March’s brighter days.
  • Sow broad beans direct: water in nicely for quick germination to evade mice, which love the seeds. If an actual drawback, develop them indoors first in deep pots and plant out after they have just a few units of leaves.
  • Plant first early potatoes: I sow in rows and easily dig slightly gap for every one, like bulbs, quite than digging trenches. Including a prime mulch of compost of well-rotted manure a month or two beforehand.
  • Plant asparagus: in case you don’t have asparagus, you have to! They take two years to settle in however I promise it’s value it.
  • Plant onion units and shallots: don’t enrich the soil, as an alternative plant these the place the soil was enriched the yr earlier than. Alliums want issues slightly on the nutrient poor aspect.


Purple basil seedlings
  • Sow basil and parsley indoors: these vegetation want numerous heat and daylight to develop nicely.
  • Order perennial herb vegetation: or develop from seed, there are such a lot of to select from however I at all times begin with rosemary, thyme, sage, bay, fennel, tarragon and chives.


  • Harvest pressured rhubarb: in case you coated a few of your rhubarb vegetation with a bucket or power, round now would be the time to select. For the vegetation pressured this yr, give them a break subsequent yr. Give all rhubarb vegetation a great mulch of compost or well-rotted manure.


  • First cuts: when you discover your garden beginning to develop, start to mow! Begin on the very best setting, after which progressively decrease it for the remainder of the season. I purpose to develop grass at about 6 – 10cm tall to permit garden weeds to flower for pollinators.
  • Apply fertiliser: for natural garden feed, use hen manure pellets or liquid seaweed fertiliser (the latter solely actually appropriate for small lawns).
  • Tidy edges: use a garden edger to tidy up the perimeters of lawns. In the event you’re as unhealthy as me at getting a straight edge, you should use a skinny plank of wooden to assist of a bit of string pegged tight into the bottom at every finish of the road you’re tidying.

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