![]() Carry on caring for them as with home-sown seed - as above.Īgain, hold back on planting out in the garden until early June in the south of England or mid-June if further north. If your plants arrive via mail order, pot on into larger pots like 9cm (3in) when the roots have filled the little modules. You can sow zinnia outdoors directly into the place where they are to grow in early June, but this is only really worth doing in reliably warm locations and on light soils. Just before they're ready to plant out, harden off (acclimatise).Ĭheck the seed packets for spacing, but setting plants at around 30-40cm (1-1.5ft) apart is about average if growing in a block, for example as cut flowers on an allotment. ![]() Sow in modules indoors at 20 oC, then as they grow move on into 9cm (3in) pots. They should flower around 12 weeks after sowing. It's best to wait until late April or early May as planting out young plants when nights aren't yet warm will only lead to sulking and vulnerability to disease. How to plantĭon't be tempted to start off your seeds too soon. If planting in containers, choose a sunny site. They grow prolifically and lushly in polytunnels too. The season will also have a bearing on success – the better the summer, the happier your zinnias will be. In cold places or on heavy soils which stay cold and don't drain well they fail to thrive. Soil type and pH isn't critical but zinnias like shelter and warmth, sunshine and moisture to grow prolifically. Plants should be planted outdoors only when all danger of frosts is past, normally June. Zinnias won't tolerate cold so need to be sown in spring not autumn. ![]() Purchase young plants in bedding packs at garden centres. Zinnias are most commonly grown from seed, but seedlings and garden ready plants can be found online or by mail order. peruviana offer cultivars and hyrbids that show improved disease resistance. Most of the annuals we grow come from the species Zinnia elegans but more slender or delicate ones like Z. If you garden in less than ideal conditions for zinnias or have been disappointed in the past, it may be worth trying plants from the Profusion Series, hybrids which performed better than many others in Yorkshire in a 2002 RHS trial. It's often wise to grow these through netting or at close spacing for support. elegans 'Benary's Giant Salmon Rose' at around 1m (3ft). But if you want length for cut flower stems, there are many taller cultivars such as Z. Opt for dwarf cultivars such as the single Z. 'Profusion White' at around 30cm (1ft). This may be a consideration with bedding and pots. Novelty flowers - the Zinderella Series has anemone centred blooms other choices are more spikey petalled, like cactus dahlias or chrysanthemums.Double flowers have a clownish, childlike element to them and often have larger size blooms.Single flowers also attract pollinating insects Small flowered singles look more slight and natural, perhaps for pairing with grasses. ![]() Some cultivars also have bi-coloured flowers with striped petals or differently coloured tips.You can also buy as single colours to make monochrome blocks.Seed mixes offer a jumble of colours or a 'curated' look so you can have rich jewel colours and brights or pale green and whites.Zinnias are popular with lots to choose from so which should you grow? There are 4 main criteria to consider: The number of colour forms are extensive, from strong reds, oranges and pinks to whites and even green flowers. The taller forms make excellent cut flowers. Plants are usually well branched, varying in height from dwarf bedding forms just 20-25cm (8-10in) high up to varieties over a metre tall. They are found naturally in scrub and dry grassland. While in the UK we grow zinnias as half hardy annuals, there are over 20 species in central America including shrubs, perennials and annuals.įlowers are carried singly at the top of upright stems, with bright green, bristly opposite leaves. Zinnias are members of the daisy family native to Mexico and South Western USA. RHS Garden Rosemoor Flower Show - Dates TBC.RHS Botanical Art and Photography Show - TBC July 2024.RHS Flower Show Tatton Park - 17-21 July 2024.RHS Hampton Court Palace Garden Festival - 2–7 July 2024.RHS Garden Wisley Flower Show - 5–10 September 2023.
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