September is a month in which we start preparing for the end of the gardening year. Although the start of the month is still very rich and gives lots of fruits the end of the month brings first frosts and cold weather which make us prepare for the end of the vegetable gardening. 
The beginning of the month should be used for harvesting. Harvest your tomatoes, apples, grapes, plums, dry beans, zucchinis, and the rest of still productive plants. Take out your potatoes and use the rainless days to dry them. 

Also, collect your flower and vegetable seeds to ensure your production next year. October fogs and frost could damage the seeds so September is the perfect time to collect them.

Once you stop harvesting it is time to start cleaning the garden, storing the poles away from the rain and snow. 

Once the garden is clean it is the perfect time to sow the late autumn varieties and prepare our early spring varieties. Sow your late peas, snap beans, spinach, winter lettuce, rucola, radishes, and lamb’s lettuce. Also sow your winter kitchen herbs like windowsill parsley, baby lettuces, mint and plant garlic, and onion for green salads.

Prune your roses, except for the ones that repeat-flowering, also keep deadheading your annual and perennial flowers.

The ending of September is the start of the first frosts. September frost mornings are usually not too strong and don’t last for many days so the only plants that will get damaged are very frost-sensitive ones. Peppers should be harvested before frost no matter if they are fully ripe or not. Tomatoes should also be harvested green, they can ripe at indoor temperatures but the frost will kill them. Beans are also very frost sensitive and should be harvested, but they can be protected with agrotextile in the evening. If the frost doesn’t last too long plants could survive. 

Cabbages can be left in the frost. but if the temperatures start dropping very low and frost keeps for more than 5 days it should be harvested. Kale, on the other hand, can stay outside and will get even tastier after it gets frostbites. The leaves get a sweeter touch.

End of the September will be a good time to start buying and planting spring bulbs. Bulbs planted in autumn will start coming out in early spring, giving us earlier flowers. Still, be careful with the bulbs that can freeze. Keep them in pots in a protected place and move outside in the spring. 

Don’t forget to use the end of the month to do your finishing grass mowing, wood storing, and garden digging.