With 1 gallon fabric pots you can keep mothers going. How big do you need a mother? Are you planning on a commercial grow? I've a friend with about 8 -9 mothers all in 1 gal and he's had them for years. Just keeps them small to not take up too much space.
I flip the mothers and raise her children to take cuttings from them. Then I take cuttings from the children and flip them, every 2 months I've a fresh round to flip and a fresh group of children to raise....I'm keeping GG#4, Gelato, Gsc, & AK47/blackberry off my last run. 2-3 cuttings off each left me with 9 clones I can take cuttings off when the time comes and the cycle continues.