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April Armstrongii attack autumn blooming blossoms blue box culture breeders breeding buds bulb culture cold cold frames colours compost Copenhagen covered crop crop rotation cultivation cut flower deep Denmark disease early fertilizer flowering plants foliage frames Freesia culture Freesia growers Freesia refracta Freesia seed fungus Gladiolus greenhouse grey mould growing conditions grown growth heat Holland hybrida inches layer of shredded Leichtlinii light manure method of culture moist moisture moved indoors necessary nitrogen number of plants obtained outdoors period possible pot cultures potash pricked produce Ragionieri raised reason rich roots Scandinavia seed boxes seed culture seed is sown seedlings seeds germinated seeds per ounce shade shows shredded peat soaking soil mixture South Africa sowing sown direct sown in boxes space spots sprinkled sufficient summer take place temperature thrips transplanting trials ture varieties ventilation vermiculite virus warm weeds yellow