![]() 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.
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