The Gardeners Almanac

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My Back Garden

Propagating Tasks in May


The bulk of the propagating tasks under glass will be nearing completion now, apart from perhaps some pricking out, and potting up of of late sowings and cuttings.

However! this does not necessarily mean it is the end of propagating, as the soil outdoors will be beginning to warm up now thus allowing propagation to take place by means of Insitu sowings and Plant division.

Note: As with most advice on gardening the advisors location will often influence the content of the advice.

To alleviate this problem I have produced this chart indicating how you can make adjustments to the timing of events as seen in this website.

I hope you find this useful! .......Tg

Week 18 - 30th Apr. to 5th May.

Sow Agrostemma, Broad beans, Cabbage (autumn), Crassula, Echevera, Lettuce, Pak choi, Physalis and Savoy seeds.

Prick out Agapanthus, Bidens, Borage, Chrysanthemum annuals, Coleus, Courgette, Cucumber, Echium, Lavatera, Leontopodium, Marrow, Platycodon, Pulsatilla and Runner bean seedlings if large enough to handle.

Take Campanula, Dicentra, Gloxinia, Loosestrife, Lychnis, Pleione, Potentilla and Thyme cuttings.

Divide Crepsis, Dahlias, Platycodon and Thyme if required.

Layer Magnolia, Rosemary, Sage and Thyme.

Pot on rooted Bacopa, Clematis, Deutzia, Elaeagnes, Garrya, Genista, Hibiscus, Philadelphus and Pieris cuttings.

Place Basil, Dahlia, Eucalyptus, Godetia seedlings / cuttings in coldframe to harden off.

Check progress on Laburnum cuttings taken the previous year.

Week 19 - 6th May. to 12th May.

Prick out Achillea, Calceolaria, Chive, French Bean, Lavender, Linaria, Oxalis, Runner bean, and Sweet Corn seedlings.

Place Gaillardia in coldframe to harden off.

Week 20 - 13th May. to 19th May.

Sow Auricula, Fennel, Gaillardia, Parsnip, Poinsettia and Runner bean seeds.

Collect and sow Fern spores.

Prick out Alstroemeria, Cabbage (autumn) Kohl rabi, Passiflora and Savoy if large enough to handle.

Take Brugmansia / Datura, Gerbera, Gunnera, Hypericum, Mint and Streptocarpus cuttings.

Divide and replant Agapanthus, Ajuga, Dierama, Eucomis, Mint, Pulmonaria and Saxifrage if deemed necessary.

Layer Azaleas if required.

Place Chilli seedlings in coldframe to harden off.

Pot up rooted Buxus, Ceanothus, Choisya and Escallonia cuttings.

Pot up Cistus and Lunaria seedlings.

Commence Chrysanthemum stopping programme.

Week 21 - 20th May. to 26th May.

Sow Pea seeds.

Pot up Agrostemma and Albizia seedlings.

Pot up Carnation and Lonicera cuttings.

Divide Papaver / Poppy.

Propagate Tulips by removing offsets / bulbils from mature bulbs.

Week 22 - 27th May. to 2nd Jun.

Sow Pak choi and Parsley

Prick out Hesperis if large enough to handle.

Now is a good time to propagate Ficus.

Place Eucalyptus seedlings outdoors to harden off.

Pot up rooted Potentilla cuttings.