If you are referring to purple (or red) fountain grass (Pennisetum setaceum
'Rubrum'), it can be overwintered in an area with bright but indirect light
and temps that remain cool but above freezing. A lightly heated greenhouse
would be best. It will be slow to emerge in spring and will need protection
from late frosts. Not always a smooth or easy experiment - might be better
to treat as an annual and replace with a well developed new specimen each
year. Seeds of this form are sterile, so propagation must be done from
division of an existing plant. Giant purple millet grows rather easily from
seed and is available at a number of seed sources.
You could try Japanese blood grass (Imperata cylindrica 'Red Baron'), which
emerges in spring with bright red new growth that intensifies through
summer, but may be marginal for your zone. Or Miscanthus 'Purpurescens', M.
sinensis 'Mt. Washington' or Panicum virgatum 'Shenandoah' - all of which
offer excellent fall shades of burgundy, red or purple but are more or less
green during the summer months.
pam - gardengal
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