I don't spend a lot of time talking about the mums- perhaps I should.
Grabbed the cam when doing the last batch of cuts.
The two on the left are young mums, only having had a maintenance pruning so far in their roughly 3 weeks in the veg area, when they went in as ~200mm tall clones. About 550-600mm as shown. These two haven't delivered any cuttings for clones yet, but are ready now as pictured. Check the 12mm thick mainstems- those fatties will make some nice clones. The thinner stems will be cut back to a lower node, the material discarded and new, thicker stems will shoot up to replace it all in the coming 14 days.
The two on the right have delivered several passes (perhaps 3-4 post their ~3 week veg-up time) of cuttings. Note thick, woody mainstems. These are getting a bit long in the tooth and will soon be replaced by the ones on the left. As they lose vigor, mums tend to deliver thinner stems that don't root as profusely nor quickly. They can also become too tall, such that they're up into the light before the 14 day cutting interval has passed. I say so long and thanks for all the cuttings- as they go sailing into the compost bin, which feeds my all-organic veggie patch out back just fine, thanks.
Here's the whole mob.
Pretty obviously, there's a lot more veg material there than absolutely needed to deliver 30 cuttings. I do compost a LOT of vegged material. However, I get more stems to choose from to get the best quality for clones.
With plants out of the mum area, you can see just how small it is. It was built around the tray, which (I'm guessing) is about 300mm x 900-1000mm. Covered by a 400HPS, ventilation by a thermostatically controlled 150mm axial (200CFM) fan, passive intake.
The mumzone is built in one corner of the flowering area. The tent-like walls are formed by a single piece of 250micron pandafilm thrown over a 2x4 screwed to the ceiling, with white sides outward. This assures no light leakage into the flowering area.