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Home / Whanganui Chronicle

Gareth Carter: Best time to water, mulching and how to take cuttings

By Gareth Carter
Whanganui Chronicle·
1 Jan, 2021 04:00 PM6 mins to read

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It is good garden practice to water in the early morning. Photo / File

It is good garden practice to water in the early morning. Photo / File

Many in 2020 found solace in the garden and around their homes. In the gardening industry we have welcomed many new faces who have taken up gardening as a new pastime.

The garden offers so many facets of interest including growing your own produce, beautifying your plot, producing flowers for picking, growing house plants, to name just a few.

The regular rainfall we are experiencing this summer is keeping the lawns lush and green so no rest from the mower yet! With the lawns in reasonably good health from regular rainfall, this is a good opportunity to do some weed control.

Broadleaf-type weeds are easy to control with a selective spray application such as Yates Turfix or Weed n Feed. Grass species are more problematic. Any creep of unwanted grass weeds are best dealt with swiftly while small, with an application of Roundup Gel wiped directly onto the weed to minimise risk of killing the desirable grass.

The moist soil conditions are good for plant growth, though, with the hot sun and wind, irrigation is still needed frequently for pots and also for gardens on lighter soils.

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It is good garden practice to water in the early morning. For vegetables such as tomatoes, it is better that plants go through the night dry if possible as this will minimise the spread of fungus diseases such as mildews, brown rot and black spot.

It is better to achieve a thorough drenching of one area rather than try to water the whole garden lightly. Try to direct the water at the soil, where the roots are, rather than over the whole plant.

We are very lucky to have an ample supply of water in Whanganui. Additional bores that were drilled a number of years ago are an asset for gardeners. We have not had summer watering restrictions for years now, enabling us to water with sprinklers every evening if necessary.

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Mulching is a good gardening practice to conserve moisture as well. This has the added benefit of adding organic matter to the soil. Plants such as our NZ natives, azaleas, rhododendrons, camellias, daphne, kalmias and liliums are plants that enjoy a cool root run and good organic mulch or compost around the base.

There are a number of options of products available to mulch with and Tui Feeding Mulch is a popular choice and highly recommended - it is formulated to fertilise, hold moisture and improve soil structure.

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It is good garden practice to water in the early morning. Photo / File
It is good garden practice to water in the early morning. Photo / File

Purchasing pea straw bales and spreading this over the garden is an economical option. I have spread bark chip over one of my gardens and this has been very successful for moisture retention and weed suppression. It looks attractive too.

January is a good month to take cuttings of many plants including both hydrangeas, buxus, houseplants and carnations. If you are successful it can be most rewarding.

It is not difficult and if you have never taken cuttings before you may like to have a go. Here are some tips on how to do it.

Choose strong, healthy shoots. The cutting should have about 2-4 pairs of fully developed leaves and should be severed from the plant with a sharp knife or secateurs. Do not pull off as this may damage the stem of the plant on which it was growing. The bottom of the cutting should be trimmed so it is just below a leaf or leaf scar and always with a very sharp knife. The lower leaf or leaves should be removed and, if the foliage is excessive, some of it can be trimmed off or back by up to one-half along the length of the leaf to prevent excessive loss of moisture. To increase the area where cell division and root development can take place a wound should be cut along the side of the cutting near its base and of approximately 1cm in length. Dip the cuttings into a rooting hormone. There are a couple of different types according to the type of plant, these will help stimulate cell division and root development. Keep your cutting material moist at all times. There are gel-type rooting hormones, Yates Clonex Red for hardwood cuttings, Yates Clonex Purple for softwood and semi hardwood cuttings or IBAdex Powdered Rooting Hormone.

Insert the cuttings into a sharp media such as propagation sand or even better is a specialist cutting mix. Daltons Premium Cutting Mix is a well-proven commercial mix used for the fast establishment of cuttings. It contains clean, screened 3mm pumice and fine-grade coco fibre and balances moisture retention, soil aeration and drainage properties. The free-draining properties reduces risk of soil-borne diseases.

Set the cuttings in a tray or a pot with mix approximately 10cm deep, make a hole with a pencil or similar and space the cuttings about 5cm apart. Gently water to settle in cuttings and place in a shady spot. Place under a plastic cover that is sealed to prevent moisture loss but allows good light.

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Check watering requirements daily. After about four weeks the cuttings should start to root. When the roots can be seen coming out of the pot's drainage holes then it is time to transplant them to a bigger pot using a potting mix with fertiliser added.

Many houseplants can be multiplied by trimming just below a leaf node as described above and then sitting in a jar or glass of water inside for 2-3 weeks. Changing the water weekly will stop you having a green stagnant swamp in your house! Some house plants such as rex begonias will produce roots just from a section of their leaf set into cutting mix. Once roots have started to appear the new plants can be carefully potted into individual pots with a suitable potting mix such as 'Tui Indoor Plant Mix'.

It is very satisfying growing new plants from cuttings so why not experiment and have a go!

• Gareth Carter is general manager of Springvale Garden Centre

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