The Gardeners Almanac

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My Back Garden

Propagating Tasks in April


Like last month, this is another busy month, with many varieties of plants needing propagating.

It should now be possible, to place some of your more hardy seedlings out in a Coldframe to Harden off.

Having said that, err on the side of safety, and keep your seedlings in a frost free environment if weather predictions are for continuous cold / freezing weather.

Keep a piece of agri-fleece at hand to throw over your seedlings in the coldframe if an overnight frost is forecast.

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 14 - 2nd Apr. to 8th Apr.

Sow Brachycome, Centaurea, Cerinthe, Chrysanthemum annuals, Coleus, Coriander, Cosmos, Dianthus chinensis, Godetia, Gunnera, Helianthus, Helleborus, Iberis, Impatiens balsamina, Lathyrus / Sweet Peas, Loosestrife, Lunaria, Nemophila, Nerium, Onion (spring), Phlox paniculata, Sidalcea and Zinnia.

Prick out Alyssum, Antirrhinum, Brussels Sprouts, Cabbage (summer), Calabrese (early), Cauliflower (summer) Celery, Convolvulus, Hebe, Melon, Mimosa, Nicotiana, Pansy, Papaver / Poppy, Petunia, Portulaca, Potentilla, Schizanthus and Verbena if large enough to handle.

Take Anacyclus, Delphinium, Ferns, Gloxinia, Lupin, Passiflora and Physostegia cuttings.

Layer Abelia, Calluna / Heathers, and Dianthus chinensis.

Divide Achillea, Cymbidium / Orchids, Delphiniums, Dianthus chinensis, Eryngium, Ferns, Gloxinia, Lupin, Osteospermum, Physostegia and Sedum.

Propagate Suckers from various shrubs / trees.

Harden off Lobelia.

Pot up Aloe, Celosia, and Fuchsia offsets.

Commence placing Chrysanthemum cuttings in coldframe to harden off.

Week 15 - 9th Apr. to 15th Apr.

Sow Albizia, Briza, Calceolaria, Calendula, Canterbury Bells, Clarkia, Clerodendrum, Coriander, Cytisus, Gaillardia, Gourds, Gypsophila, Kniphofia, Mimulus, Nigella, Parsley, Potato, Reseda, Rhubarb, Squash and Verbascum seeds.

Prick out Actinidia, Ageratum, Agrostemma, African Marigolds, Anomatheca, Aubretia, Auricula, Basil, Broad beans, Brachycome, Callistephus, Celery, Crepsis, Eschscholtzia, French Marigolds, Impatiens balsamina, Laurentia, Leeks, Mesembryanthemum, Nemesia, Nolana, Physostegia, Rudbeckia, Tagetes, Tropaeolum / Nasturtium seedlings if large enough to handle.

Place Brussels Sprouts, Calabrese (early) in coldframe to harden off.

Pot up Sweet potato slips immediately on receipt.

Take Agrostemma, Bacopa, Billbergia, and Fatsia japonica cuttings.

Divide Bellis, Gerbera, Heuchera and Hostas.

Remove growing tip from Petunias.

Sever layered Blackberry, Loganberry and Tayberry cuttings.

If weather conditions are suitable, divide established Aquilegia plants and replant the divisions immediately.

Week 16 - 16th Apr. to 22nd Apr.

Sow Bidens, Borage, Cactus, Carrots, Chionodoxa, Chives,Courgette, Crocus, Echium, Hesperis, Lavatera, Lavender, Oxalis, Peas,and Pumpkin seed.

Prick out Aquilegia, Begonia, Calendula, Canterbury Bells, Centaurea, Cerinthe, Chilli, Cosmos, Dianthus chinensis, Godetia, Helianthus, Iberis, Mimulus, Nemophila, Orache, Phlox drummondii, Reseda, Watermelon, and Zinnia if large enough to handle.

Pot up Clerodendrum, Colutea, Laurus noblis (Bay) and Surfinia cuttings if rooted.

Take Alstroemeria, Carnation, Lavender, Penstemon and Physalis cuttings.

If weather conditions are suitable, divide established Alstroemeria, Canna, Chionodoxa, Crocus, Geum, Physalis and Sidalcea plants and replant the divisions immediately.

Collect Chionodoxa and Crocus seeds.

Place Aubergines, Callistephus, Cauliflower (summer), Celery, Ipomea and Pansy in coldframe to harden off.

Week 17 - 23rd Apr. to 29th Apr.

Sow Beetroot, Catananche, Chicory, Cucumber, Endive, Freesia, French Beans, Kohl rabi, Linaria, Marrow, Pulmonaria, Rosemary, Runner beans, Sedum, Spinach, Squash and Sweet Corn.

Prick out Campanula, Clarkia, Coriander, Gaillardia, Gourds, Gypsophila, Nigella, Pumpkin, Sidalcea, and Thyme if large enough to handle.

Pot up Dahlia cuttings

Place Antirrhinums, Brachycome and Echinacea in cold frame to harden off.

Divide Bamboo, Houtuynia and Kniphofia if required.

Take Convallaria and Elaeagnus cuttings.