Why a calendar helps even experienced growers

New members often plant reactively — whenever seed or seedlings happen to be available — rather than according to any deliberate seasonal plan, which tends to produce uneven harvests and gaps in production through parts of the year. A simple planning calendar, built around Nairobi's two rainy seasons and the dry stretches between them, helps members plant with the season rather than against it.

Planning around the long and short rains

The long rains, historically running from March to May, and the short rains, historically running from October to November, are the two windows when planting water-demanding crops carries the least risk and requires the least supplemental watering. We advise members to schedule their more water-intensive plantings — tomatoes, for example — to begin just ahead of one of these windows, so that establishment and early growth coincide with more reliable rainfall.

As covered in our climate-smart agriculture article, these seasonal windows have become less predictable in recent years, so we teach the calendar as a starting framework to adjust based on actual observed conditions each year, rather than a fixed schedule to follow regardless of what the season is actually doing.

Filling the dry months with resilient crops

The stretches between the rains are not empty periods in a well-planned calendar; this is when the drought-tolerant crops covered in our five vegetables article — African nightshade, amaranth, and mulched kale among them — carry the bulk of a household's production, requiring far less supplemental water than the crops planted around the rains.

Staggering plantings within a season

Rather than planting an entire bed or all of a household's sacks on the same day, we teach members to stagger plantings by a week or two within a single planting window, which spreads the harvest out over a longer period instead of producing one large glut followed by a gap. This is the same staggering principle covered in our tomato growing article, applied across a household's whole planting calendar rather than a single crop.

Building a personal calendar

We help members build a simple, personalized version of this calendar during training, marking down what they actually plant, when, and how it performs, which over a year or two becomes a far more useful planning tool than any generic calendar alone, since it reflects the specific conditions of that household's own plot, sacks, or rooftop rather than a Nairobi-wide average.

Adjusting the calendar for a household with limited time

Not every household can commit significant time to garden management year-round, and we help members with more limited available time build a simplified version of the calendar focused on the lowest-maintenance windows — planting the most drought-tolerant crops timed to need the least supplemental attention, rather than attempting a full, more labour-intensive planting calendar that assumes more consistent available time than a household actually has.

A simplified calendar built around realistic time constraints, followed consistently, produces better results than an ambitious full calendar that ends up only partially followed because it assumed more time than was actually available.

A calendar is only as useful as the real observations a household adds to it over time, so we treat the framework covered here as a starting point rather than a finished tool. Members who keep even simple notes on what they planted, when, and how it performed end up, after a year or two, with a planning resource considerably more accurate for their own specific plot than any general Nairobi-wide calendar could be. We would add that a planting calendar is ultimately a planning aid, not a guarantee, and members should expect to deviate from it in any given season based on actual conditions rather than following it rigidly regardless of what the weather is actually doing. Flexibility within a general structure is the goal, not strict adherence to a fixed schedule. We would add that even an imperfect calendar, followed loosely, tends to outperform no planning at all, so new members should not feel they need to get every detail right before starting to use one.

Key takeaways

  • Time water-demanding crops to begin just ahead of the long or short rains.
  • Fill dry-month gaps with the drought-tolerant crops covered in our five vegetables article.
  • Stagger plantings within a season to avoid one large glut followed by a gap.
  • Adjust the calendar each year based on actual observed rainfall, not a fixed schedule.

Frequently asked questions

How do I build my own personalized planting calendar?
Start with the general framework here, then track what you actually plant, when, and how it performs over a year or two.

What if the rains arrive later than expected?
Delay planting by a week or two rather than sticking rigidly to a calendar date, watching soil moisture and short-range forecasts instead.

Does the calendar apply the same way to sack gardens?
Yes — the same seasonal timing principles apply, though sacks can be more flexible since they're easier to shield or move than open beds.

Can this calendar be adapted for a household with no rainy-season timing constraints, like a borehole?
Yes — households with a reliable independent water source can plant somewhat more flexibly, though staggering plantings still helps avoid a single overwhelming harvest.