By Jeff Bennett
Jeff
at the Dry Creek Garden establishing the iris beds
As you may know, it takes years to prepare for an American
Iris Society (AIS) national convention. In this post, I share the story of how
the Dry Creek Garden in Union City, California became a place where “The Sun
Sets on Rainbows.”
In 2014, I was a fairly new Gardener at Dry Creek
Garden and wanted to add to the existing irises already growing there. I
remembered purchasing rhizomes from an iris society booth in Benicia in the
late 1990s and thought it might be just the place to get more irises at good
prices. On the second Saturday in August I returned, hoping they would again
have a booth. Sure enough, some very nice ladies from the Mt. Diablo Iris
Society had traveled from Walnut Creek, and I was able to purchase 25 different
named varieties from their booth. While I was there, a few former horticulture
classmates of mine introduced me to Shirley Trio-Probst. Shirley was preparing
for a proposed convention in California’s Bay Area and was looking for a garden
with room to plant up to 1,000 irises for the 2018 AIS National Convention. She
gave me more details than I could absorb in 38 minutes, but I shared my thought
that the Dry Creek Garden might have an area. I told Shirley I would have to
ask my supervisor for permission after explaining the details to him and would
get back to her.
Upon looking for places in the garden to plant these
irises, my supervisor and I agreed on a good location if the convention
committee thought so too. After some time had elapsed, Shirley arranged for the
movers and shakers of the local iris scene to come check out the garden. None
of them had been to the Dry Creek Garden before; not even then AIS Regional Vice
President John Pesek or his wife Barbara who only lived a few miles away. Our
meeting went well, and I was told Dry Creek would be considered (along with other
locations) to become one of five display gardens for convention tours. Many
more months passed without word, until we found out that Northern California would
not host the 2018 convention, but the 2019 convention instead. After two other
locations under consideration had trouble committing to the rules of the convention
and other logistics, in fall 2015 the committee offered Dry Creek the gig.
During the 2015 Region 14 Fall Meeting, a meeting for
all convention garden hosts was held. Names, phone numbers and emails were
exchanged along with the planting bed rules. Beds were to be 4 feet wide and no
longer than 40 feet long. Pathways were to be 6 feet wide so two people could
be bent over facing each bed and taking pictures at the same time. Irises also
needed to be planted in alphabetical order by name from each hybridizer. So I
ran with these rules and started designing the layout of the beds on paper to
best use the terrain we were dealing with.
In fall 2016, the first irises were to arrive. These
were the beardless ones: Louisianas, Siberians, spurias, species hybrids and
Pacific Coast hybrids. September 2016 saw the first three beds made in a patch
of soil that had never been cultivated before. Lots of rototilling, adding compost,
measuring bed boundaries and irrigation installation was done prior to planting
the first beardless irises. Beardless irises need to be planted a year earlier
than bearded irises for a convention to help get them established for a better
display. This was completed and I now had about a year to get the bearded iris
beds made before their arrival in fall 2017.
Preparing
soil with a rear-tined rototiller for new iris beds
Installing
irrigation for beardless iris beds at Dry Creek Garden
The area where the bearded iris beds were planned to
go was an open field. It needed a fence to enclose the area and protect it from
wildlife and the public. Being a public agency, we had to get our board of directors’
approval to appropriate funds to install an 8-foot-tall cyclone fence around
the area. The soil had also never been cultivated before. It was just a sloping
hill of non-native grasses (weeds, to be frank) and a few California poppies
poking through the smothering grasses. In April 2017, I prepared and delivered a
PowerPoint® presentation to the board to show where we would be planting the
irises. The presentation included fabulous pictures of irises in bloom so there
was no way they could say no. When all was done, they approved the $15,000
fence.
A
tractor with bucket and box blade helped us break ground for the bearded iris
beds.
We broke ground for the planting in mid-July 2017,
which was before fencing was installed. I couldn’t wait for the fence any
longer as the bearded irises would be arriving over the next two months. First by
mowing the weeds, then plowing the soil with a tractor. It was a hot and dry
time of year in California, so I had to pre-wet the area to rototill for 21
beds and pathways. Damp soil made this easier but it still took days to
complete.
Wooden
stakes and orange flags marked the future locations of iris beds and pathways.
Once the area was satisfactorily loosened up, a
volunteer and I went to work measuring out the bed and path perimeters. This done,
we shoveled soil from planned pathways into the planned beds to raise them 6-8
inches above the path. This was back-breaking work to say the least, but two
months later the beds were built. About 3-4 inches of compost was added to the
top of each bed and rototilled in. Next, the initial dripline irrigation was
laid onto the top of each bed, but it could not be hooked up to water until the
water line was brought in and this was not completed until spring 2018. Once
the dripline was installed, we were ready to plant!
Bearded
iris beds in progress at Dry Creek Garden
Starting on October 1, 2017, the members of the Mt.
Diablo Iris Society helped plant 740 bearded irises at the Dry Creek Garden. These
were hand watered for the first six weeks until the period of regular, seasonal
rainfall began. We also planted 46 bearded seedlings near the 37 beardless
seedlings planted in 2016 as part of a unique event for the 2019 AIS National
Convention. Bearded seedlings would compete for the prestigious name ‘Centennial
Celebration’, and beardless for the equally prestigious name ‘Centennial
Anniversary’, which would commemorate the 100th Anniversary of AIS happening
in 2020. Each attendee would cast their vote for their favorite bearded and
beardless seedling during the convention. Winning the competition would be
tricky as the seedling would have to be blooming on the day of the garden tour,
planned five years ahead of time, between 8am and 3pm in late April at a
convention host garden in Northern California. The winning bearded entry and
beardless entry would be announced at the final banquet of the convention. What
are the odds of it all working out?
Volunteers
from the Mt. Diablo Iris Society at Dry Creek in October 2017
Mary
Sindicic organizing bearded guest irises for planting.
Park
Ranger Sandy carefully arranged bearded iris rhizomes along irrigation lines.
I
was also carefully spacing out guest irises to ensure each had room to grow and
thrive.
Riley
Probst planting a rhizome in a delightfully well-prepared raised bed.
Shirley
Trio-Probst hand-watering one of the 740 newly planted rhizomes.
During the planting, I had already begun to trap
gophers. Three the first day, three the second day, then nothing. That was the
beginning of over 100 gophers dispatched from the iris area over the next two
years. Not a single iris was lost to gophers during that period. (I use Victor Black
Box® traps, in case you’re wondering.) Once gophers were trapped, they were put
out for the wildlife to eat which they gladly did. Not a gopher wasted!
For three long months after planting, there was no
fence. The company that won the bid to do the work had to complete their fence
project at the Oakland Zoo before they could start ours. I had many restless nights
wondering if someone was pilfering irises from the Dry Creek Garden. Luckily,
none were taken. Deer tasted some of them, but rhizomes were left on the ground
near their planting hole and I could quickly put them back in their spot. Only
one, ‘Miles of Smiles’ by Mike Sutton, was never found. The fencing company
arrived to start our project on December 31, 2017; and I could finally stop
worrying. Three days later, the irises were safe in their cyclonic enclosure.
Stay tuned for Part II describing the next sixteen
months leading up to the 2019 AIS Convention, “The Sun Sets on Rainbows.”
