The days are growing longer and we’re experiencing warmer afternoons which means that spring is just around the corner. The arrival of spring means a new and fresh start to a new growing season for all avid and budding gardeners.
In this blog, we’ll look at a few simple jobs we can do to give us a flying start on our spring gardens and how to get started on planting your potatoes, so you have lovely new potatoes ready to harvest for Christmas Day.
Prepare your soil
By now you should have turned in any green manure crops back into the soil. However, if you haven’t done this you can do it over the next few weeks.
Due to the recent wet weather, I have delayed this chore because of overly wet soil. If your soil is still very wet, holding off won’t cause any issues as generally your soil will also be cold. The soil needs to be warm and free draining to break down the organic matter in the green cover or manure crop.
It’s also time to boost the nutrients in your soil. I recommend sprinkling some agricultural lime and or Earth Zing over your soil. Add these products just prior to digging over the soil. Even if you had bare soil over winter, it’s still fine to add these products. Don’t add any other fertilizers or plant foods at the same time and take care not to spread any lime where you will plant your potatoes as this can lead to a skin defect called scab.
Select and plant your potatoes
Decide on your preferred variety and purchase these. If you need help just ask your local garden centre about which varieties suit the local conditions.
It’s best to purchase certified seeds as these are guaranteed to be disease-free. My personal preferences are Jersey Benny and Liseta. I plant just enough ‘First Early ‘seeds to grow for eating just prior to Christmas and through till early January when these early ones are replaced with either a mid or late season variety.
For my mid to late season option, I prefer a general-purpose potato like Desiree or Agria which have both proven themselves in my garden over the last 15 years. Desiree is also an excellent early variety (good for Xmas) when small and if left until later, they mature to a good size. Try a few different options to discover what grows well in your conditions.
Lay your seeds out in trays (old egg cartons are great for this) for 4-6 weeks to allow ‘shoots’ to sprout. Place your trays in a warm spot out of direct sunlight. You will have seeds ready to plant out by early to mid-September. Most early varieties take between 70-90 days from planting to maturity so you should be digging your first new potatoes from late November onwards. There are regional differences due to varying soil temperatures across New Zealand.
Tips for planting out potato seeds
1. Place seeds with the ‘sprout’ facing upwards and bury seeds just below the soil surface.
2. When I plant my seeds, I place a little Guano (1-2 teaspoons) under each seed as a fertiliser.
3. When the first shoots appear through the soil surface gently form a mound of soil to fully cover the shoots. Repeat this process weekly until you have a reasonably large mound. If you are planting in rows this will usually be just prior to when leaves start to touch each other. Also, just before your final mounding you can side dress with a fertiliser. I use blood and bone with a little sulphate of potash added.
4. Once the first true leaves have formed on the potato plant, I spray the foliage 7-10 times per day with liquid fish fertilizer (seaweed is a good alternative).
5. After the flowers on the potato plants have died, your potatoes will be almost ready. To test, simply gently scratch around the plant to check the tuber size.
All the best,
Mr Bokashi