My interpretation of this is fertile soil with organics breaking down and no root system to take it up, goes what used to be termed "sour". A very well drained gritty soil may not be a problem as it will be easily flushed with regular watering. A heavy organic soil will hold excess nutrients and maybe breakdown gases inhibiting root growth. A pot full of roots will have good drainage; at least until it gets choked.
Brian Whyer, UK (intrigued by the possibility of an annual crop of pencil thin rhubarb ;-)
On Friday, 10 January 2020, 14:37:21 GMT, David Pilling <david@davidpilling.com> wrote:
Hi,
In the North West of England rhubarb does go dormant in Summer and
recently people have sold varieties which do not exhibit this behaviour.
Turning to seedlings.
Old gardners would curse my efforts with "don't over pot it", by which
they meant don't use pots too big. Reading this discussions makes me
think that the seedlings don't know how big their pots are, but big pots
may be easier to overwater or offer some other environmental hazard.
I used to feel that extra deep pots were the things for bulb seedlings
(again maybe combatting my over watering).
Looking at Gastil's mini-plunge makes me think that once one has made
that leap forward some kind of computer control of conditions would be
easy and cover many pots.
In reality seedlings always seem to like to grow in the cracks between
paving flags.
--
David Pilling
http://www.davidpilling.com/
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