Hartley Magazine
Greenhouse growing
Month by month
As seen in Gardens Illustrated A new guide on the 1st of every month
The weather has been strange this spring, with low temperatures and chilling winds, punctuated by hot days. Gardeners are used to erratic conditions, for sure, but this spring has been very odd. One interesting feature is that drought and dry cold wind have meant the best slug free hostas in the garden for years and […]
Early May is the time to sow outdoor cucumbers, marrow, squashes, pumpkins (vertically on edge, not laid flat like a surf board) French and Runner beans and Sweetcorn in gentle heat around 20C in peat substitute seed compost or multipurpose compost individually in 7.5cm pots, ready for planting out once the danger of frost has […]
From now on the weather should begin to warm as spring progresses (note the use of the word ‘should’…. you never know these days!). Sow broad beans, spinach, cabbage, calabrese, kohlrabi, cauliflower, lettuce, peas for pods and shoots onions, salad onions, turnip, radish, beetroot, leeks, leaf beet and chard in the greenhouse. From the middle […]
This is the time of year when you really appreciate having a glasshouse. It buys you extra growing time while the weather outside is erratic. Sow crops in the propagator if you have one or in a cold greenhouse and cover with fleece. Plants can be potted on, if necessary, before hardening off and transplanting […]
Plants like peppers, chillies and aubergines, which need a long growing season should be sown this month. If you sow them now, they will ripen but leave too late and they will not. The third week in February is ideal, mid-March is fine and the first week in April is the limit. They need light, […]
It is not always practical to grow everything from seed, so make a list of plants you intend to sow and those to be bought as plug plants. Plug plants save time and space in the greenhouse and heating costs, too. Once you have placed your orders, write the labels for the seed trays, put […]
Open greenhouse vents for as long as possible on mild sunny days, shutting them before temperatures drop early in the afternoon. The combination of high temperatures and low light makes leaves and stems soft, spindly and prone to grey mould which spreads rapidly in cool, damp conditions. Though good air circulation is vital, avoid chilling […]
The much publicised health benefits of turmeric, including anti-inflammatory and antioxidant properties, have made it a popular addition to everything from lattes to smoothies to teas. Although fresh turmeric tubers have been said to have more potent health benefits than the powdered turmeric sold in grocery stores, a small bag of them can cost upwards […]
It’s still not too late to sow batches of winter salads every week or two in an unheated greenhouse. Growing them in trays, pots, old growing bags or borders as ‘cut and come again’ crops to harvest through autumn and into winter. Try hardy salads like land cress, radish, carrots for leaves, any of the […]
Check your greenhouse heater to make sure that it works before the cold nights set in, have a roll of horticultural fleece on standby and pay attention to the weather forecast. It is worth investing in a back-up heater, too. There is nothing worse than being caught out by a sudden early frost Leave chillies […]
Early in the month, especially if it is warm and sunny, sow trays, pots or old growing bags with ‘cut and come again crops’ to harvest through autumn and into winter, think land cress, oriental salads, like pak choi, mizuna and mibuna greens plus lettuce, lamb’s lettuce, chicory and radish. You can also use what’s […]
Sow Fennel, oriental vegetables like mizuna greens and Pak Choi, rocket, coriander dill, spinach, claytonia and land cress, in modules as soon as you can in August. These will germinate quickly and can be planted out by mid-August for an Autumn harvest. Blossom End Rot, where the end of tomatoes becomes circular, black and flattened, […]
