hmmm used to work at a retail nursery as senior horticulturist.. hope this helps.. Go to any good florist and buy something called Pokon (for cut flowers) , either sachet or conentrate form, dilute then pour the solution in the vase or something.. put the roses in, make a 45 degree cut on the stem with the part u cutting UNDERNEATH the water.. Minimise any air contact with the cut part, as air bubbles will trap there and affect water uptake. put the roses in the vase away from sunlight and temp should be as close to 5 degrees as possible. not any lower, or ur rose will kana frost damage. If you are going to sell those roses one, DONT open the netting that covers the rose petal. else it will bloom open very big if placed in temp higher than 5 degree celcius.
