Autumn Plant Care: Getting Your Grow Kits Ready for the Colder Months

As the days shorten and temperatures start to dip, your plants need a different kind of care than they did in summer. Whether you're growing a bonsai, tending a herb kit, or looking after houseplants and succulents, autumn is the season where small adjustments now prevent problems later.

In this guide, we'll walk through what changes as the seasons turn, and how to adjust your care routine for bonsai trees, herb kits, houseplants and cacti/succulents heading into the colder months.

Why Plant Care Needs to Change in Autumn

As daylight hours reduce and temperatures cool, most plants naturally slow down. Growth rates drop, water needs change, and many plants shift into a period of dormancy or reduced activity that lasts through winter.

Feeding and watering routines that worked well in the warm, bright months of summer can actually do more harm than good in autumn if left unchanged. Overwatering and overfeeding a plant that's naturally slowing down can lead to root problems, weak growth and increased vulnerability to pests and disease.

The key principle across almost all plant types heading into autumn is simple: less is more.

Bonsai Trees: Preparing for Dormancy

Many bonsai species — particularly deciduous varieties — begin preparing for winter dormancy as temperatures drop. This is a completely natural part of their growing cycle, not a sign of a problem.

What to adjust:

• Reduce feeding. Most bonsai trees need little to no fertiliser once growth slows in autumn. Feeding a dormant or slowing tree can push new growth at the wrong time, leaving it vulnerable to cold damage.
• Watch watering closely. As growth slows, bonsai trees typically need less frequent watering. Check the soil before watering rather than sticking to a summer schedule — a moisture check at the surface will tell you more than the calendar will.
• Consider location. Some bonsai species are more cold-hardy than others and can stay outdoors through autumn and winter, while more tender varieties may need to move somewhere more sheltered. It's worth checking the specific needs of your tree species before the first frost arrives.
• Hold off on repotting. Autumn generally isn't the ideal time to repot a bonsai, since the tree's energy is shifting toward dormancy rather than root recovery. Most repotting is better suited to early spring.

Herb Kits: Transitioning Indoors

Many herbs that thrive outdoors in summer struggle once temperatures consistently drop, making autumn the natural point to move a herb kit indoors — particularly for more tender herbs like basil.

What to adjust:

• Find a bright spot. Indoor light levels are naturally lower than outdoor light, even next to a window. A south-facing windowsill (or the brightest spot available) will help herbs continue growing well indoors.
• Reduce watering frequency. Indoor conditions combined with slower growth mean herbs typically need less frequent watering than they did outdoors in summer. Overwatering indoors is one of the most common causes of herb kit problems at this time of year.
• Watch for leggy growth. If herbs start stretching and becoming thin or leggy, it's usually a sign they need more light rather than more water or feed.
• Hold back on feeding. As with bonsai, growth naturally slows indoors during the colder months, so feeding can generally be reduced or paused until growth picks back up in spring.

Houseplants: Adjusting for Lower Light and Humidity

Houseplants that have been growing steadily through summer will notice the shift in light and humidity as autumn sets in, even if they live indoors year-round.

What to adjust:

• Reduce watering. Lower light levels mean slower growth, and slower growth means less water uptake. Letting the top layer of soil dry out between waterings is a safer approach than sticking to a summer routine.
• Move plants closer to light sources. As natural light weakens, repositioning houseplants closer to windows (while avoiding cold draughts) can help maintain healthy growth through the darker months.
• Watch humidity levels. Central heating can dry out indoor air significantly once it's switched on for the season, which can affect humidity-loving houseplants. Grouping plants together or using a humidity tray can help offset this.
• Ease off feeding. Most houseplants need little to no feeding once their growth slows for the season — resume a regular feeding schedule again in spring as new growth appears.

Cacti and Succulents: Preparing for a Drier Dormancy

Cacti and succulents are particularly sensitive to autumn and winter overwatering, since their natural dormancy period means their water needs drop more dramatically than most other plants.

What to adjust:

• Cut back watering significantly. Many cacti and succulents need very little water through autumn and winter — often just enough to prevent the soil from becoming completely dry. Overwatering during dormancy is one of the most common causes of root rot in these plants.
• Stop feeding. Feeding during dormancy isn't necessary for most cacti and succulents and can disrupt their natural winter rest period. Resume feeding in spring as active growth returns.
• Keep them somewhere cool but frost-free. Many varieties actually benefit from cooler autumn and winter temperatures as part of their natural cycle, provided they're kept away from frost.

A Simple Autumn Checklist

• Reduce feeding across most plant types as growth naturally slows
• Check soil moisture before watering, rather than following a summer schedule
• Move light-hungry plants (herbs, houseplants) closer to available light sources
• Be especially cautious with watering cacti and succulents as they enter dormancy
• Hold off on repotting bonsai until spring
• Watch for signs of stress — leggy growth, dropped leaves, or slowed growth are often normal seasonal responses rather than problems

Final Thoughts

Autumn doesn't mean your plants need less attention — it means they need different attention. The biggest adjustment across bonsai, herb kits, houseplants and succulents is the same: scale back watering and feeding in line with slower natural growth, and give plants the light and shelter they need as conditions change.

Getting these small adjustments right now sets your plants up to come through winter in good shape, ready for strong growth again in spring.