This section is from "The Horticulturist, And Journal Of Rural Art And Rural Taste", by P. Barry, A. J. Downing, J. Jay Smith, Peter B. Mead, F. W. Woodward, Henry T. Williams. Also available from Amazon: Horticulturist and Journal of Rural Art and Rural Taste.
Although the Dielytra is properly classed as a spring flowering plant, yet, if propagated by cuttings of the young shoots in the spring, and planted out in Jane in a sheltered situation, it will continue to throw up a succession of blooms till late in the season. It thrives best 'in a rich light soil, and should be plentifully supplied with water in dry weather. Last season I saw a bed so treated in the front of a greenhouse, in bloom in September, and it appeared likely to continue in flower much longer, if frosts did not occur To procure a stock of plants, a few old roots should be placed in heat in February; take off the young shoots as they advance, and strike them in a similar way to dahlias; they should afterwards have a shift, and he kept in a frame till all danger of frost is over, when they may he planted out as above.
Another authority says: -
It is decidedly wrong to recommend dividing a plant of Dielytra at any season it may be in growth, with the view of strengthening the plant You may divide it for the purpose of increasing the number of plants.
The way to manage them for large specimens is to put them into their flower. ing -pots as soon as it is safe to turn them out after flowering; to plunge the pot one inch over the rim in a warm, sheltered place, where the wind is net likely to affect the shoots; to see that the plants do not want for water, or have too much of it; to cut them down any time after the 20th of September; to take up the pots and turn them on their sides in a dry shed or outhouse early in November When we transplant the roots from the open ground the flowers are not so fine.
 
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