Zaragoza, 3 August 2026. Today we begin preparing seedlings of brassicas, mustards, beetroot and spinach for the autumn garden. The summer garden is still facing the most demanding temperatures of the year, but the calendar is already asking us to look towards the next season.
The sowing date changes according to the variety, the planned transplant date and the climate of each area. This reference belongs to our garden and the Ebro Valley; we do not present it as a universal rule. Germination, seedling development and transplant timing will be recorded in the following field-journal entries.
When to sow cabbages in Zaragoza
August means working with two calendars at once. The first belongs to summer crops, which still occupy space and demand water. The second belongs to brassicas, which need to get started so they can reach autumn with enough development before transplanting.
In this entry we document one specific decision: starting the cabbage seedlings on 3 August 2026. The crop guides and the annual sowing and harvest calendar help us place the task in context; following the seedlings will show us how each variety responds this season.
The challenge of raising cabbage seedlings in August
Summer seedlings face one particular difficulty: the growing medium loses moisture quickly and exposure changes considerably between the middle of the day and the afternoon. At this stage we are not trying to draw conclusions early, but to establish conditions that we can check every day and record carefully.
Our starting observation is simple: we are preparing the autumn garden during the period of greatest heat pressure of the summer. There are no shoots or germination data to analyse yet.
Our working hypothesis is that starting indoors, followed by two weeks of outdoor hardening, will allow the seedlings to reach transplanting with more even development and without unnecessary stress. It is a hypothesis for this sowing and these conditions, not a universal recommendation for every climate.
This entry will follow one specific sowing, from preparing the trays to transplanting.
Tray inventory (108 cells)
The complete sowing will occupy 108 cells, distributed among four boxes and nine trays. This is the starting inventory:
| Box | Tray | Title (Name) | Variety | Quantity (Cells) |
|---|---|---|---|---|
| Box 1 | Tray 3 | Romanesco | Natalino | 12 |
| Box 1 | Tray 4 | Savoy cabbage | Virtudes 3 | 12 |
| Box 1 | Tray 5 | Cauliflower | Violet | 6 |
| Box 1 | Tray 5 | Cabbage | Oxheart | 6 |
| Box 2 | Tray 1 | Brussels sprout | Medio Enana de la Halle | 12 |
| Box 2 | Tray 2 | Cabbage | Asa de Cántaro Selección Mirandela | 12 |
| Box 3 | Tray 6 | Kale | Red Curly Scarlett | 6 |
| Box 3 | Tray 6 | Kale | Nero di Toscana | 3 |
| Box 3 | Tray 6 | Kale | Dwarf Green Curled | 3 |
| Box 3 | Tray 7 | Pakchoi | - | 12 |
| Box 4 | Tray 8 | Beetroot | Gigante Blanca | 6 |
| Box 4 | Tray 8 | Mustard | Amsoi Rey Mostaza | 3 |
| Box 4 | Tray 8 | Mustard | Gigante Roja | 3 |
| Box 4 | Tray 9 | Spinach | Merlo Nero | 12 |
| Total | 108 |
This selection brings together different brassicas, leafy crops, mustards and beetroot so that we can compare their development as the season advances. We will keep every variety identified from the seedling stage to preserve traceability when it is time to assess transplanting.
The four boxes and their respective trays prepared to start the autumn seedlings on 3 August 2026.
How we will prepare the seedlings
The strategy is to start indoors, where we can control temperature during the first days and maintain steady moisture. We will prepare the growing medium, distribute the seeds according to the inventory and label every combination of box, tray, plant and variety.
When maximum temperatures begin to fall below 40 °C, we will move the trays outdoors in a planned way. This will begin a two-week hardening period before final transplanting, allowing the plants to gradually adjust to light, wind and temperature changes in the garden.
Our management criteria for this first stage are:
- Check the moisture of the growing medium and the indoor temperature every day.
- Keep every cell labelled to preserve sowing traceability.
- Move the trays outdoors when maximum temperatures fall below 40 °C.
- Complete two weeks of outdoor hardening before final transplanting.
- Record the first shoots and any changes to location or watering.
💡 Field note: We are not trying to expose the trays to extreme heat from day one. First we will control the indoor conditions; afterwards, moving outdoors will be part of the hardening process rather than an abrupt change immediately before transplanting.
What we expect to observe
At the close of this entry there are still no shoots to record. We do not yet know when the first seedlings will emerge, whether the four groups will develop at the same pace or whether we will need to adjust their location or moisture management.
That uncertainty is not a problem in the journal; it is precisely what we want to document. This seedling batch, in this Zaragoza summer, will provide the answer.
Can you raise cabbage seedlings in August?
This journal starts from an August plan to prepare the autumn garden in Zaragoza. The date must be understood alongside local weather, exposure and the ability to keep moisture stable. We will therefore record the process before drawing conclusions for other seasons or places.
What we can say for now
The first important decision is about timing: preparing autumn before summer ends. The second is about method: at this stage it is more useful to observe frequently and record what happens than to follow a rigid routine without responding to the day’s conditions.
We still cannot assess germination, uniformity or seedling adaptation. Those data remain pending and we will not treat them as facts until we have observed them.
Next follow-up
Over the next few days we will check moisture and record the first shoots by variety. The next decision will be to determine when the seedlings have developed enough to begin considering transplanting.
