How to keep a plant breeding log: a beginner's guide
A breeding program is only as good as its records. Here is how to start a breeding log that lets you repeat successes and prove a seedling's parentage.
Breeding plants is mostly patience, but the part that turns patience into progress is the record. A breeding log is what separates a deliberate program from a windowsill of mystery seedlings. It lets you repeat a success, learn from a failure, and prove the parentage of anything worth naming. Here is how to start one and keep it useful.
Why a log matters
Without records, a cross is just a hope. With them, every pollination becomes data you can act on. A good log gives you three things: reproducibility (you can make the same cross again), lineage (you can prove what a seedling is), and selection (you can compare siblings and keep the best on evidence, not memory).
What to record for every cross
The moment you make a cross holds the most information, and the most temptation to skip writing it down. Capture at least this:
- Seed parent and pollen parent, by convention the seed (pod) parent is written first, the pollen parent second. Note which is which; it matters.
- Date of pollination.
- A cross ID, a short unique code you assign, so you can label the plant and find the record later.
- Method and conditions, hand-pollination, emasculation, whether you bagged the flower, the weather or greenhouse conditions if relevant.
- Goal, one line on what you hoped to achieve, so future-you remembers the intent.
Give every cross an ID
A consistent cross ID is the backbone of the whole system. Many breeders use the year plus a running number, 26-014 for the fourteenth cross of 2026, and write that code on the pollinated flower's tag immediately. Every later record, every seed packet, every seedling tray, and every photo refers back to the same ID. It is a small habit that prevents almost every record-keeping disaster down the line.
Follow the cross through its stages
A cross is not one event but a chain of them. Note the date and outcome at each step:
- Pollination, recorded as above.
- Pod or seed set, did it take? How much seed, and when harvested?
- Sowing, when and how the seed was sown, and how much.
- Germination, when seedlings appeared and roughly what percentage.
- Grow-on and selection, the traits you observe as seedlings develop, and the ones you keep.
Each stage teaches you something. Poor seed set might point to incompatibility or timing; low germination might point to seed handling. Recorded over several seasons, these notes quietly teach you how to breed your particular plants better.
Record traits, and cull on evidence
As seedlings grow, the log becomes a place to compare them. Note the traits you care about, flower colour and form, vigour, leaf shape, scent, hardiness, bloom timing, with measurements and dates where you can, and photos wherever possible. Photographs taken at a consistent stage are far more honest than memory.
Most seedlings from a cross will not be keepers, and that is normal. The discipline of breeding is selection: choosing the few worth growing on and recording why, so your eye and your decisions improve over time. A log that records the rejects as well as the winners is what makes that possible.
Naming and registering a winner
If a seedling earns it, you may give it a cultivar name and, in some groups, register it with the relevant authority. At that point your log is no longer a private notebook, it is the evidence of parentage that backs the name. A clean record of the cross, the date, and the lineage is exactly what a registry, a buyer, or a fellow breeder will want to see.
Keep it consistent, keep it backed up
The best log is the one you actually keep. Whatever the format, aim for three qualities: every cross has a unique ID, every entry has a date, and the whole thing is backed up so a lost notebook is not a lost decade. Tying each record to the living plant, and to its photos, keeps the breeding story and the plant itself in one place.
That is what the Leafolio breeding journal is built to do: record both parents of a cross, follow the seedlings, and keep the lineage attached to the plants in your collection, so a promising seedling never loses the story of where it came from.