What Time Changes in a Calendula Oil Infusion: Why I Sent My Oil to a Chemist
- Denise Benoit
- Feb 17
- 5 min read
Updated: Feb 18
I’ve been growing calendula and infusing it into oil for years, and I’ve always loved the process. There’s something deeply satisfying about watching the flowers slowly give themselves to the oil. But the more I worked with calendula, the more curious I became.
Online, I kept seeing the same timelines repeated again and again — four weeks, eight weeks — often without much explanation. I started wondering what those timeframes actually meant. Was there a meaningful difference between them? Was more time truly giving the oil more, or was it simply habit being passed along?
At the same time, I was considering double-infusing my pro-aging serum. That would mean more flowers, more time, and more care — and before committing to that process, I wanted to know if the extra investment was truly being reflected in the oil itself.
So I decided to send my oil for testing. Not out of doubt, but out of curiosity. I wanted to better understand what was unfolding during the infusion — how calendula moves into oil, and what time quietly makes possible.
And to understand that, it helps to begin with calendula itself.
Calendula at the Beginning
Calendula has always been at the heart of my work. I grow it, I work with it season after season, and it’s a flower I genuinely love and return to again and again.
When calendula is infused into oil, it slowly releases oil-soluble compounds that give the oil its warm golden colour. It’s not a plant that rushes. The change happens gradually, over time.
Because calendula is the foundation of so many of my formulations, I’ve learned to pay attention to those small shifts — the deepening colour, the softening flowers, the quiet way the oil changes as weeks pass.
This project grew out of my relationship with calendula — and a simple curiosity about what time is really giving the oil.
What I Wanted to Know
With calendula, time is always part of the process. But I kept wondering how much time actually mattered.
Was there a meaningful difference between a four-week infusion and an eight-week one? And if fresh flowers were added partway through, would the oil continue to deepen — or had it already given what it could?
Before committing to longer or double infusions in my work, I wanted to understand what was really happening over time. Not just by looking at the oil, but by measuring it.
How We Looked at It
To explore this more clearly, I had several calendula-infused oils analyzed by an independent lab. Each oil was made with the same flowers and the same base oil — the only difference was time, and how the infusion was handled along the way.
The lab focused on measuring calendula’s naturally occurring oil-soluble compounds — the same compounds responsible for the oil’s deepening golden colour as it infuses. These measurements allowed us to compare how much calendula was present in the oil at different stages of infusion.
Each sample was tested multiple times to ensure the results were consistent. This wasn’t about chasing perfection, but about understanding patterns — and seeing whether what I was observing visually was actually happening beneath the surface.
What Time Changes in a Calendula Oil Infusion
Before any numbers were reviewed, the difference was already visible.
Using the same flowers and the same oil, I compared a calendula infusion at four weeks with one at eight weeks. The change wasn’t subtle. The oil infused longer had deepened noticeably in colour — warmer, richer, more saturated.
This visual shift was one of the reasons I wanted to take the project further. It suggested that calendula was still actively moving into the oil — that time was continuing to play a role.
Sometimes the first clues aren’t found in data, but in careful observation.
What Time Gave the Oil
After seeing the difference in colour, the oils were analyzed to better understand what was changing over time.
The results confirmed what the eye suggested: as infusion time increased, so did calendula’s naturally occurring oil-soluble compounds. The jump from four weeks to eight weeks was clear — and when fresh flowers were added after eight weeks, the infusion deepened even more.
What stood out wasn’t just that more time made a difference, but that calendula hadn’t finished giving at four weeks. Or even at eight. With the right conditions, the infusion continued to deepen.
This helped put language to something I had sensed for a long time — that patience isn’t just a preference in this process, it’s part of how calendula works.
I’ve always believed time mattered in this process. Seeing it measured helped me trust that instinct.
What This Tells Us About Slow Infusion
This project reinforced something I’ve come to trust through experience: slow infusion isn’t passive. It’s an active, unfolding process.
Calendula doesn’t release everything at once. Its structure and the way it interacts with oil suggest that time matters — not as a fixed rule, but as a relationship. As the weeks pass, the oil continues to change, deepen, and take on more of what the plant has to offer.
The results also showed that refreshing the flowers partway through the process can invite the infusion to continue, rather than plateau. It’s a reminder that working with plants isn’t about shortcuts, but about listening and responding.
In this way, time becomes more than a waiting period. It becomes an ingredient.
What This Means for How I Work
Seeing this process more clearly has helped affirm choices I was already leaning toward.
Because calendula is such a foundational ingredient in my work, understanding how it behaves under different conditions matters. Longer infusions and refreshed flowers require more care, more patience, and more plant material — and this project showed that those choices meaningfully change what ends up in the oil.
This curiosity also led to a second round of testing. At the chemist’s suggestion, we explored whether increased mechanical movement would affect the infusion. One oil was gently shaken by hand each day, while another was placed on a mechanical shaker that ran continuously, twenty-four hours a day, for eight weeks.
Interestingly, the oil that was simply shaken by hand each day contained higher levels of calendula’s oil-soluble compounds than the one exposed to constant mechanical agitation.
That result reinforced something I value deeply in my work: more force isn’t always better. Consistency, gentleness, and time allow the plant to offer more than constant intervention.
Because this second round of testing explored a different variable entirely, I’ll be sharing those findings in a separate blog, where they can be given the space and clarity they deserve.
Sometimes confirmation is quiet.
A Quiet Kind of Proof
This project began with curiosity — and a desire to better understand something I already cared deeply about.
The testing didn’t replace intuition or experience. It simply gave language to what had been unfolding all along: that calendula rewards patience, and that time plays an essential role in how the oil develops.
For me, this wasn’t about proving anything. It was about listening more closely — to the plant, to the process, and to what happens when we allow things to take the time they need.
Sometimes the most meaningful confirmation is quiet.
Learn More About Why Calendula Infusion Time Matters
This project was designed to better understand the infusion process itself. The findings shared here reflect the specific materials, methods, and timelines used, and are offered for educational and transparency purposes.
If your curious like me and want to read the full technical report, you can read it here or download it below👇:
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