looking for information about my rose bush. I received this yellow
rose bush about 15 years ago – it was beautiful.
In the last two years, the flowers have all been red. The roses are
pretty, but I am curious as to how the flowers changed color.
A: It is common
practice for rose growers to graft a desired rose variety onto a
rootstock of a different rose. Grafting allows growers to produce
more plants in a shorter time and get them to market faster.
Rootstocks are chosen to impart a particular growth habit, increased
winter hardiness, vigorous growth and stronger establishment to
roses that possess outstanding ornamental characteristics (flower
size, color, number, fragrance, growth habit, foliage). Grafting
makes it possible for us to enjoy roses that otherwise might not be
winter hardy in our climate or that grow so weakly only experienced
and well-equipped rosarians can care for them properly.
generally appears as a bump or knob near the base of the plant. In
our climate, it is good practice to plant roses so this graft union
is two inches below the soil surface.
Roses Winter Kill
the top of a grafted rose – the yellow rose you started out with –
can die from winter injury. The following spring, the rose appears
to start growing as normal, but when it blooms, the flowers are
often much different than the original rose. The roses that are
blooming for you now are from the rootstock – there are a number in
common in use.
Protection for Roses
One of the
easiest ways to protect roses for the winter is to mound about eight
inches of soil up over the graft union. This ensures that the
variety survives the winter, not just the rootstock. Make sure to
pull the soil from other areas of your yard, not from around the
base of the rose.