Locals in Glasnevin out for their sole daily walk are looking enviously through the black gates of the National Botanic Gardens.
The fine weather and spring bloom has the home of the largest plant collection in Ireland looking its most beautiful.
Dr Matthew Jebb, the director of the National Botanic Gardens of Ireland, said the gardens are "an artistic achievement" and laments that their beauty will not be widely seen this year.
"Even the boring plants: it's an artistic endeavour, and you want people to be able to appreciate it," he said.
The spring bloom that's here now will likely be gone by the time the gardens are able to open to the public again.
Between food supply chains and funeral services on the Government's list of essential services is the "operation of botanical gardens, parks, forests and nature reserves".
Though the staff is much more limited than usual, keeping the gardens going in the midst of Covid-19 is essential.
Dr Jebb explains that the gardens have been keeping a daily, manual record of the weather for 180 years.
A human records it by hand, with a pen and paper, every single day.
Even Christmas Day.
At a weather station at the back of the gardens, in an area not open to the public, Brian Furlong, the foreman, is still recording rainfall, sunshine and temperature with machines such as sun cards and Stevenson screens that date back to the 1940s.
In 2018, the gardens were given new, modern weather-recording machines which Dr Jebb and Mr Furlong look at with barely concealed contempt.
"Fuses can fail and machines can break. You need a human," Dr Jebb said.
"That's the problem with progress - it often isn't."
Human progress has been a disaster for nature, so it's no surprise that human disasters allow nature to progress.
Dr Jebb explained that after the 9/11 terrorist attacks, all flights were suspended for four or five days over the eastern seaboard of North America.
Temperatures fluctuated more, and it was discovered that was because cloud formation was far more dynamic without the effect of contrails from jets.
Now, the gardens will have a similar record of what the impact of the Covid-19 lockdown was on these 19.5 hectares in Glasnevin.
"So the value of this, it's like a natural experiment of a couple of weeks of reduced air flights. What will the effect be?" Dr Jebb said.
"It's at a crisis when people realise, 'Gosh, that's important information.'"
Record-keeping at the gardens has also been slowly charting climate change.
Since 1966, the gardens have recorded the date on which a group of flowers opened, the leaves unfurled, and the leaves dropped off.
This 54 years' worth of data on when spring starts has shown that it now starts two weeks earlier in Ireland.
Because spring comes sooner the farther south you are, it is the equivalent of Ireland moving south at a rate of 4km per year, which is 12 metres a day or 50 cm an hour.
"Now, that is mind-bogglingly quick. But in 1966, when these plants were sent and planted here, nobody thought we were starting to record climatic change," Dr Jebb said.
There are tens of thousands of different types of plant life at the botanic gardens, some of which are very precious and rare and need to be looked after.
The gardens feature plants that Roger Casement brought back from the Congo basin in the early years of the 20th century, as well as a tree that has been saved from extinction.
Dr Jebb said that the great thing about horticulture is a socialist ethos of sharing - it's in everyone's interests to keep plants alive. He points out one tree in a greenhouse which was rescued from extinction from the Pitcairn Islands by one of the botanic gardens staff.
A cutting was taken from the sole remaining tree on the island, which was later destroyed in a landslide.
Jean Burtchaell, who is working in the education garden, is "looking after the babies".
She is keeping tiny plants alive for when the garden will hopefully be open to school groups again.
Bringing children into the gardens is crucial. Ms Burtchaell has designed things like a bug hotel, a worm feeder and beds of unusual plants such as chocolate tomatoes to try to inspire little horticulturalists.
There's also a mini-bog, which teaches children about climate change and carbon.
Bogs store more carbon than rainforests.
Dr Jebb points out that the average age of a Bord na Móna briquette is 3,000 years. "And we throw that on a fire. It's pretty horrific, actually."
Dr Jebb said it's "difficult to think of something more valuable" than encouraging children to aspire to working in horticulture.
"People who know how to produce enough food to feed the human race are surely the most important people on the planet," he said.
"They are the people who are going to feed your great-grandchildren.
"And who would those people be? You know, are they lawyers or bankers? No. They are scientists and horticulturalists."
As staff work, they've noticed birdsong is louder and birds are able to build nests in new places.
Foxes are getting bolder and "emboldened" crows are coming closer.
"And if that's just happening here, it must be happening with nature all over Europe," Dr Jebb said.
"The hard thing is trying to keep some of that."