CULT: mulch & till

My tall bearded irises are lined out in 'corn' rows, with rows spaced
far enough apart that I can till them with a cultivator on the back of a
farm tractor.  They haven't been tilled for about three years (various
excuses...).

I plan to experiment with either coarse sawdust or bark mulch from a
local mill between some of the rows this year.

Should I try to till before putting down the mulch or just mulch?

Or is this another grand opportunity to experiment?
--
Linda Mann east Tennessee USA zone 7/8
East Tennessee Iris Society <http://www.korrnet.org/etis>
American Iris Society web site <http://www.irises.org>
talk archives: <http://www.hort.net/lists/iris-talk/>
photos archives: <http://www.hort.net/lists/iris-photos/>
online R&I <http://www.irisregister.com>

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