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Gardening Tips for September, Ideas, and Techniques

Introduction to gardening tips for September: September is usually a cooler, faster month than August and the days are significantly shorter. It’s also time to get out and plant spring-flowering bulbs for next year and you can also collect seeds for next summer. September changes the weather as autumn approaches, the leaves begin to turn golden and temperatures start to fall. However, there’s plenty to keep you busy in gardening in September, because autumn is a fantastic time of year to plant your spring bulbs, feed your lawn or prepare your winter vegetable plantation.

Gardening tips for September, vegetable, flower, fruit, herbs gardening in September, greenhouse, houseplants, shrubs and general plant care in September 

Gardening Tips for September, Ideas, and Techniques
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Vegetable gardening in September 

  • Nip a Sweet Corn kernel. If it releases a milky juice, it means it is ripe. If not, they need a little more time to ripen. 
  • Cut the Potato leaves on the ground level about three weeks before they are lifted and stop the scorched seeds affecting the tubs.
  • Let the Potatoes dry for a few hours before storing them in a cool dark spot.
  • Prevent the Pumpkin and squash from rotting by placing them on a wooden plank to lift them from wet soil.
  • Feed and water French Beans to make the most of them. Continue harvesting to prevent them from planting seeds.
  • Get rid of old crops that have withered. Cut the weeds and leave your plot clean.
  • When the Beans and Peas are finished, cut them on the ground level and leave the roots in the soil. These crops cure nitrogen which is gradually released into the soil as soon as the roots break.
  • Start planting Garlic bulbs and Onion sets at the end of September.
  • Once the tops are falling up, harvest the onions and the necks start drying and shrink just above the bulb.
  • Sowing seeds of Radish, Lettuce, Spinach, and other vegetables in a cool frame will prolong the fall crop.
  • Nip over Brussels sprout plants to flush out the developing sprouts.
  • Tie leaves around Cauliflower heads when they are the size of a golf ball.
  • Pinch any young Tomatoes that are too small to ripen. This will use energy to cook the remaining full-sized fruits.
  • Sow Winter Spinach under the mulch for the spring crop.
  • As Tomatoes finish their production, they cut plants, pick up any debris, put the dead or diseased plant parts in the trash, or take them to the landfill. Many diseases will be more than winter on old infected leaves and trunks so they are best removed from the property.
  • An annual Ryegrass cover crop can be sown in vegetable garden areas which will benefit from the growth of organic matter.
  • Cover the beds with lawn clippings and leaves raised during the fall grass cutting.
  • Spread the newly dug Potatoes to dry for a few hours before storing them in a cool, dark place. 
  • Lift pumpkin and squash from the ground to prevent rotting. Place them on a plate or piece of wood.
  • Cover your Brassica with a net to prevent birds from making food from them.

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Image Source: Pixabay

Flower gardening in September

  • Beautify the flowering borders with autumn flowering plants like Chrysanthemum.
  • Start planting winter flower bulbs such as daffodils, Gladiolus, and Dahlia.
  • Prune the climbing and rumbled roses.
  • Sow sweet peas in a cool frame or the greenhouse for early summer opens next year.
  • Sow other hardy annuals such as Calendula, Centaurea, Limnanthes, and poppies. 
  • This is a good time of year, especially for new perennial planting saplings at the end of September as the soil is still hot, but moisture levels are rising.
  • Continue the Feed and Deadhead Hanging Basket and Container annually, they will often continue to frost first.
  • Keep Annuals and perennials dead headings to enhance their performance.
  • Deadhead your Penstemons, Dahlias, and Roses to bring flowers.
  • Divide the herbaceous perennials as the weather cools down. Plant well and water in the new distribution. 
  • Prune flowering bushes at the end of summer, such as rock roses. 
  • Prune Roses and Rumbled roses once they have finished flowers.
  • Keep the Camellia and Rhododendron well in water at this time of year to ensure that next year’s buds develop well.
  • Apply water-soluble manure on your containers and hanging baskets to make the plants healthy and blooming.
  • Daffodils are planted this month, this will provide the welcome color for early next spring. Drifts of a dozen or more bulbs of one variety make the most impact and can be easily planted by digging the whole planting area 6 to 8 inches deep, spacing the bulbs according to the package directions, fill in the soil and water well.  
  • Move indoors any tender perennials, such as Fuchsias, Gazanias, Lantanas, and Abutilons, before frosts cause damage.
  • Some tall late-flowering perennials, such as Asters, may still need staking to stop them from being blown over in the wind.

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Gladiolus Plant
Image Source: Pixabay

Fruit gardening in September 

  • Trim grass under fruit trees.
  • Rake up leaves, twigs, and fruit from Crab Apple trees and throw them in the garbage to help control apple scab disease.
  • Pick and throw away any dropped apples that show signs of apple maggot.
  • Continue to water any new shrub or tree plantings until the first hard frost if fall rains are unusual.
  • Check all with the Peachtree trunks just below the soil line for gummy mass due to the borers. Investigate holes with thin wire to puncture the bores.
  • Pot up the Strawberry runners to make more plants for next year. Pick rotting fruit from Pear, Apple, and Stone fruit trees, if left on a tree, they will spread the disease.
  • Cut long grass under fruit trees so that it is easier to find the fruits of the storm.
  • Cover the Peach trees trained by the wall to prevent the grip of peach leaf curls. The fungus needs wet conditions to affect plants.
  • If you’ve not already done it, cut your summer Raspberry fruited canes, leaving new green canes for next year’s crop. Tie in next year’s Raspberry Cane to support wires or fencing.
  • Pick Blackberries when they ripen and use straight or freeze something for later use.

Greenhouse care in September 

  • Discard the contents of old manure and rotten plants. Reduce the risk of pests and diseases next year through greenhouse cleaning.
  • Remove the greenhouse shed and let your plants get as much light as possible.
  • Water early in the day so that the greenhouse dries up by evening.
  • Trap the heat overnight by closing vents and doors at the end of the afternoon.
  • Damping becomes usually unnecessary as the month progresses. It is better to do any water or damp at the beginning of the day so that the greenhouse dries up by evening. 
  • Water greenhouse plants early in the day so the Greenhouse dries up by Evening. Moist, cold nights can encourage botrytis.
  • Close greenhouse vents and doors at the end of the afternoon to help get stuck in the heat overnight. This will ensure your plant crop for as long as you can.
  • The contents of old manure and rotten plants can shelter unwanted insects in winter.
  • Prepare a Hyacinth bulb in pots or Hyacinth glasses for fragrant indoor flowers.
  • Takedown the greenhouse shade netting or wash the shading paint by the end of the month, as the light level begins to fall. 
  • Be alert to pests and diseases in the greenhouse, and immediately treat any you get. 
  • Plant dwarf spring bulbs to the pots for early flowers, including Iris, Crocuses, and Scilla. 
  • Water house plants are less frequent and remove them from particularly cold windows at night. 
  • Pay close attention to greenhouse ventilation, turn off vents on cold nights. 
  • Check greenhouse heaters are in good condition.  
  • Look at the early frost forecasts and be prepared to bring the plants of the tender pots into the cover. 
  • Transfer pot-containing Peaches and Nectarines to a cool greenhouse or porch. 

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Greenhouse care
Image Source: Pixabay

Herbs gardening in September 

  • Although the growing season is about to end, there is still plenty of seed sowing that could be done in September. If you’re growing herbs indoors on windows, you can still start new plants that don’t need a lot of heat, like coriander and chives. Hardy flower herbs such as Calendula, Nigella, Feverfew, and Poppy can now be sown out, for the early display of flowers next spring.
  • September is a great time for berries, such as Rosehips, Sloes, Haws, and Juniper berries. Whether you grow them in your garden or have a passion for going out for a forage, it’s time to collect these little wonders.
  • In the garden, enjoy many fresh leafy herbs like Mint, Sage, Oregano, and Thyme, as their harvest season will soon be over. 

Houseplants care in September 

  • Take a cutting of Begonia, Geranium, Coleus, Impatiens, and Fuschias to grow as domestic plants. Cutting can be made a quarter inch below the node, where the address meets the stem, the hormone is immersed in connecting and inserted into the potting medium at a bright point but not directly in sunlight and kept moist.
  • Small tender perennials, like some Fuchsias, can only be cut back and are not allowed to dry as long as more winter in cellar windows. If there is a danger from frost, bring the plants inside the house.
  • Make or propagate herbs to bring them indoors for winter use.
  • Carefully examine the insects before bringing them back in. Give them good grooming if necessary. You would like to spray plants with insect soap after eliminating the leaves. Let the plants dry first.
  • Move house plants to their inner locations before the furnace turns on so they can start getting used to low internal light and humidity levels.
  • Pot-bound plants will appreciate the large quarters. Repot sheep plants can now be enjoyed outside.

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Image Source: Pixabay

Trees and shrubs care in September 

  • Early fall is a good time to plant trees and shrubs and gives time for the root system to be established before the earth freezes.
  • Remove the fallen leaves and make manure.
  • Plant the Peonies now, but make sure the crown is buried just one and a half to two inches below the earth’s surface. Planting them more than two inches deep could prevent them from opening next spring.
  • If the pesky seedlings of woody plants like Maple, Elm, or Hackberry are found growing in your yard, remove them as soon as possible so that they do not occupy gardens and other landscape plantations.
  • First, continue watering any new bush or tree planting until hard frost.
  • Fall is the correct time to plant trees and shrubs. These new plants will have more than a few months to grow new roots and will be ready to grow early next spring. 
  • Trees that bleed or suffer from infection can now be pruned if pruned in spring. This includes maples, Birch, Black Walnuts, Oaks, Honey Locusts, and Mountain Ash. Prune young trees to a central leader, remove the broken, cross, or rubbing branches, and slowly remove the lower branches.  
  • Good garden hygiene helps in preventing disease, so it is very important to throw out or destroy diseased leaves. 
  • Honey fungus can be more common in wood plantation areas while harmless fungi often come to moist lawn areas or mulch.
  • Honey-fungus bodies will begin to appear in late September and early October, indicating possible areas of infection. However, there are many harmless fungi that appear at this time, so don’t be too scared.
  • Hot, dry, powdery mildew in Indian summer can still cause trouble. Until it is severe, it will probably clear after the rain comes.

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Honey Locust
Image Source: Pixabay

General plant care in September 

  • Improve soil before it gets very wet or frozen by adding organic matter and/or horticultural grit.
  • Sow green manure like Buckwheat, Clover, and Ryegrass on uncultivated areas to improve soil and keep weeds down in winter.
  • Make compost bins in preparation for all the fallen leaves and dead plant materials that you will collect in the coming months. Autumn leaves add great to compost boxes and are ideal for making leaf mould.
  • Burn the contents of the houseplants from the disease or dispose of it in your home or green waste. Do not make it compost as seeds can remain in fertilizer and affect your plants again.
  • Lift the pots from the ground for winter using bricks or pot feet to prevent waterlogging.
  • Clean the pond weeds in anticipation of autumn leaves falling and trap your pond.
  • Blitz perennial weeds are more vulnerable to weed killers in the autumn. Use a selected glyphosate-free formula to kill both leaves and roots.
  • Install water butts to collect rainwater this autumn and winter. Rainwater is great for watering ericaceous plants such as Blueberry, Rhododendron, and Camellias.
  • Trap across ponds to prevent autumn leaves from falling and rotting. 
  • Water autumn-flowering Asters to regularly stop fungus. 
  • Check that tree ties and plant support are firmly in store, before any autumn gales. 
  • Collect fallen leaves to store in a chicken wire cage or bin bag to make the leaf mould. 
  • Hunt Rosemary Beetles on Lavender and Rosemary, pick striped Metallic Beetles and their grey larvae. 
  • Collect brown rot-infected Apples, Plums, and Pears to reduce the spread of fungal disease. 
  • Check Roses for fungal disease symptoms, such as Black spots, and pick and bin all affected leaves. 


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