Starting with the agave filiferas, the normal form I would guess has grown, it looks much bigger now, so the March 2014:
And August 2016
Probably only a little bigger, but a lot fuller.
The form with no white markings: March 2015
Not sure I can tell the difference in that one at all. It definitely seems to be slower than the standard form and not sure that the lack of white markings on the leaves really add anything.
The largest agave montana: June 2014
The middle sized one has been moved to the front garden, so onto the smallest agave montana: March 2014
These have grown a lot, a shame the angle is different. Not really a surprise as they love being in the ground. They seem to be one of the agaves that stops growing for me when it gets warm (yes even in the UK).
Next up probably my favourite form of parryi, agave parryi HK1684. March 2014
Then August 2016
Another one that has really grown, although not so obvious from the photo. I'm not a big fan of the narrow leaf forms, and this one not only has wide leaves, but the spines are a really good colour. It is now a proper artichoke shape.
The agave ovatifolia has been one of the quickest growers. There is no doubt that this is one of the best agaves for the UK, even from a small size it seems to have a lot of cold and wet tolerance. March 2014.
It had to be moved at the start of this summer, which has set it back a bit, but still impressive growth.
A second much larger plant has been added elsewhere in the rockery as well.
There are a few other other agaves in there as well, I don't seem to have multiple photos for these.
and then in August 2016
What is more worrying is the new pup, This was not there last year, so that is one years growth and it is already over 30cm across and almost as big as the the agave gentryi which has been in the ground since 2014.
Having been to a garden a few days ago with one of these, I have seen what they can become. More on that once I have checked the owner is happy for me to write a post on his garden.
I think come spring next year the pup will be dug up and moved to take over somewhere else!