Your October Gardening Jobs Checklist for Greenhouse and Allotment Watering

At a Glance

October gardening jobs include adjusting watering as temperatures and daylight fall, checking soil conditions and maintaining greenhouse and allotment irrigation. This guide covers October gardening jobs, including how often to water a greenhouse in autumn, how to identify changing plant needs and how to prepare exposed irrigation components before the first frost, including where automatic watering can help.

Ready to simplify your autumn watering routine? Purchase a WaterMate System or Build Your Own setup to automate irrigation across your growing space today.

Why October Watering Needs Change as Temperature Drops

October watering usually needs to be reduced as temperature and daylight hours fall because plants lose moisture more slowly. However, greenhouses, polytunnels and other covered growing spaces can still get warm and dry, so adjust watering to the conditions. The change from summer to autumn affects both how quickly plants use water and how long moisture remains in the soil. Outdoor beds may benefit from regular rainfall, while plants under cover may not receive any.

Before watering, check the soil or compost around the roots and, if it is still damp, wait and check again later. If it has dried out, water thoroughly so moisture reaches the root zone. This should be one of your key autumn jobs, especially if you have continued growing under cover or are still harvesting crops from your allotment.

Your October Watering Checklist

Now that you know how autumn conditions affect watering, use this checklist to cover the main October gardening jobs for your greenhouse and allotment.

1. Check soil or compost before watering.
2. Adjust watering as temperature and daylight fall
3. Check greenhouse ventilation and condensation
4. Clear drainage holes and remove finished plants
5. Check irrigation equipment and watering zones
6. Check water butts or tanks
7. Check containers and sheltered areas in the allotment
8. Prepare exposed irrigation components before the first frost

How Often Should You Water a Greenhouse in Autumn?

There is no fixed number and the right frequency depends on the crop, temperature, sunlight, container or bed size and how quickly the growing medium dries out. 

Checking below the surface is better than relying on a set weekly schedule. A sunny greenhouse can become warm enough to dry containers quickly, while several cool, cloudy days can leave the growing medium damp for longer. Water in the morning where possible, giving foliage time to dry before nightfall. 

At the same time, actively growing plants will need regular moisture, while crops finishing for the season will generally need less water as their growth slows. The same principle applies to irrigation, so review the settings, adjust them as conditions change and don’t let systems run at the same frequency throughout autumn.

What Greenhouse Jobs Should You Do in October?

Once you’ve adjusted watering, check the rest of the greenhouse for other October gardening jobs.

Good ventilation remains important on warmer days, as condensation and prolonged damp conditions can create problems when temperatures fall. Check that drainage holes are clear and that containers are not sitting in water. Remove dead leaves and finished plants so they do not remain and harm healthy crops.

Your irrigation system also needs a seasonal check, so include it among your October gardening jobs. Inspect tubing, drippers, sprayers, filters and connections for blockages or damage, then make sure the watering pattern still matches the plants remaining in the greenhouse. This gives you a better foundation for the colder months, since you know which crops are still being watered, which areas you can remove from the schedule and whether the equipment is ready to keep working.

What Allotment Jobs Should You Do in October?

Allotment jobs in October differ mainly because of rainfall, which affects how much allotment irrigation you need. Outdoor beds may receive plenty of natural water, but containers, sheltered areas and crops under cover can still dry out. So check the soil where the plants are growing before watering and don’t assume that a wet path or saturated bed means every part of the plot has enough moisture.

October is also a useful time to inspect your water supply and irrigation equipment. Check your water butt or tank, clear debris from filters and look for damaged pipework, blocked drippers or loose connections. If you have several growing areas, consider their needs separately. A bed that is still producing crops may need continued irrigation, while a cleared area can be removed from the watering routine. This is where separate watering zones can make a practical difference. Each zone can follow the needs of the plants growing in it and doesn’t need to follow one schedule across the whole plot.

How Can You Tell If Your Plants Need More or Less Water?

Look at the soil or compost before adding more water. Dry compost can mean a plant needs watering, while consistently wet compost may mean you need to water less or check the drainage. Plants can also give clues through wilting or drooping leaves, which may indicate too little or too much water, although other causes are possible.

A plant’s water needs can vary even within the same growing space, whether in a greenhouse or an allotment. A small container may dry out faster than a deep bed, while a sunny area can lose moisture faster than a shaded one.

These differences mean you should adjust watering to each plant's conditions rather than follow one fixed schedule.

Can Automatic Watering Help with Autumn Irrigation?

Automatic watering can help when plants need regular care, but you cannot check them every day. It can also make it easier to manage different watering requirements across a greenhouse, polytunnel or allotment.

Harvst WaterMate combines programmed watering schedules with sensors to automate irrigation. The temperature sensor can trigger extra watering when it gets hot and the system can give less water when it is cool or overcast, helping maintain consistent watering as conditions change.

For smaller growing spaces, WaterMate Mini is designed for greenhouses up to 6 square metres. It supports up to 40 drippers or 12 sprayers and can run from a 10W solar panel or 240V mains power. Its pump can draw water from a water butt or garden hose. For larger growing spaces, WaterMate Pro supports up to six watering zones with extra zone controllers. Separate zones let different parts of a greenhouse, polytunnel, garden or allotment have their own watering schedule.

Power and water access can also shape the right setup. Harvst offers solar-powered configurations for growing spaces without convenient mains electricity, while its system can be configured to use stored water with a suitable pump.

For off-grid allotments without Wi-Fi, the solar-powered 4G versions of WaterMate Mini and Pro can connect using the Harvst Connect 4G add-on, which is free for the first 12 months.

If you want to see how an automated setup works in a real growing environment, the Setting up a Harvst WaterMate Pro video shows the controller, solar power and irrigation components working together.

For gardeners who need a setup built around a particular growing space, water source and power supply, Harvst also offers Build Your Own WaterMate. This lets you configure the irrigation system around the requirements of the garden or allotment, rather than adapting the growing space to a fixed kit.

How Should You Prepare Your Irrigation System for November?

Unlike the gardening jobs in October, November requires you to prepare any exposed irrigation components for colder months as temperatures fall. Protect or drain parts that could be damaged by freezing, particularly exposed pipes and water lines. WaterMate is designed to detect freezing temperatures and stop pumping to protect itself, but winterising it is still recommended for long-term reliability.

If parts of your greenhouse or allotment no longer need irrigation, shut those zones down for winter. Allotment jobs in October may have focused on adjusting watering as conditions changed, but November is more about responding to colder weather and higher rainfall. Keep watering active only where crops are still growing and need regular moisture.

For covered growing spaces, how often to water a greenhouse in autumn depends on temperature, daylight and the crops you are growing. As November gets colder, check that plants still receiving water aren’t being overwatered. Water earlier in the day where possible so the surface can dry before temperatures drop and keep monitoring their needs. Outdoor beds may receive more natural rainfall during November, so factor that in.

These checks help protect your irrigation system while keeping water available for plants that still need it through winter.

Looking for a Smarter Way to Water?

If you are planning your October gardening jobs for your greenhouse or preparing your allotment for the colder months, Harvst can help you simplify irrigation management with WaterMate.

Harvst’s WaterMate is designed for growers who want to automate irrigation across greenhouses, polytunnels, gardens and allotments. To try it out, purchase WaterMate, build a setup to suit your preferences, add other irrigation products and components or enquire with Harvst to find a system for your growing space.

Product specifications and features are subject to ongoing improvement. For the latest details, please see individual product listings.