Do you love digging for hidden treasures in your soil, but sometimes feel disappointed in your harvest? If so, these tips should help make growing root crops much easier and more successful.

Best tips for growing root crops

Discovering an edible surprise is a bit like unwrapping a present, isn’t it? You get that feeling of anticipation as you unearth a handful of potatoes or pull up a bunch of crunchy carrots. Then you start dreaming up how you’re going to enjoy eating those tasty homegrown crops.

So let’s dig into some juicy tips on ways to get more of these delicious vegies and spices on your plate.

What are Root Crops?

There are many plants you can grow for their edible underground harvest. This collective group of ‘root crop’ vegetables include tubers, bulbs, roots and rhizomes. Now we’re getting fancy about who’s who! Let’s dig a bit deeper.

Root crops include beetroot onions garlic potatoes ginger carrots and radishes

Root crops include beetroot, onions, garlic, potatoes, ginger, carrots and radishes

A few of the more commonly grown root vegetables and spices include:

  • Tubers: potatoes, sweet potatoes and yams;
  • Rhizomes: ginger, turmeric, asparagus and rhubarb;
  • Bulbs: onions and garlic;
  • Roots: beetroot, carrots, radish and kohlrabi.

Next, what sort of seeds, tubers, bulbs and rhizomes should you plant? Can you plant supermarket potatoes or imported garlic?

Sowing Safe Root Crops

I suggest you always source certified organic, non-GMO, chemical-free and heirloom varieties. Why is this important?

  1. To avoid harmful, chemically treated seeds and planting material. Grow safe food!
  2. Root crops are particularly susceptible to absorbing chemicals from the soil.(1)

Conventional produce is grown with chemicals (such as fungicides, insecticides and herbicides). Mmm … sounds yummy doesn’t it? So if you try to plant supermarket spuds, it’s likely they won’t shoot. Why not? Because unless they’re organically grown, potatoes are sprayed with chemicals to stop them sprouting on the grocery shelf under all those lights. How could they sell sprouting potatoes?

What about garlic? Now that opens another can of worms! Don’t get me started.

Garlic is so good for health when grown organically

If you don’t know where your garlic comes from or how it’s grown, read my article on growing gorgeous garlic. It’s a real eye-opener.

Pesticides in Root Crops

Soluble pesticides and chemicals in the soil are taken up via the roots and into the plant. Whilst washing and peeling may remove some toxic residues(2), EWG’s Pesticides in Produce report and other studies* have found potatoes and carrots often contain more pesticides than other conventionally grown vegetables. Not all root crops absorb chemicals in the same way or quantity(3). Studies have shown different root crops soak up high levels of some chemicals and low levels of others, but the point is, they end up in your food.

According to one report ‘Behaviour of Pesticides in Plants’, “Roots are the principal absorbing organs for soil-applied pesticides. Water-soluble pesticides are readily absorbed by the roots and may be transported to other parts of the plant.” 

Root vegetables like beetroot and carrots are safer for consumption when home grown or organic

Root vegetables like beetroot and carrots are safer for consumption when home grown or organic

So, if you love your potatoes and other root vegetables, consider growing your own and buying organic if you can. When you consider the cumulative effect of these toxic compounds in the body over time, particularly if root crops are part of your diet, it may be wise to start sooner than later. Especially if you want to start a family(4).

* References:


Growing Root Crops in Contaminated Soil

One solution to avoiding contaminated soil is to make your own potting or seed raising mix so you have a clean, safe growing medium. This gives you control over the food you grow, so you know there are no chemicals from day one.

Making your own potting mix is quick, fun and easy

Making your own potting mix is quick, fun and easy

Polluted soil can occur from many sources including:

  • Ground water moving through your garden from neighbouring properties;
  • Grey water may contain chemicals from household products and medications;
  • Lawn sprayed with herbicides may leach into garden beds;
  • Flooding with contaminated water and waterlogged soil;
  • Previous property owners or garden maintenance contractors may have used toxic chemicals with residues lasting many years;
  • Chemicals leaching from treated timber, PVC or other unsafe containers you may be growing food in.

Toxic residues are easily taken up by root vegetables. Into the part you eat – inside the vegetable – and you can’t wash it off. Mmm … food for thought right?

Next time you go to pick up that cheap bag of perfect looking carrots or gleaming white garlic bulbs imported and chemically treated at the supermarket, you have a choice to make. I urge you to make the effort to grow your root crops from safe seeds and plant material or support local farmers who grow organically.

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When is the Best Time to Plant Root Crops?

This varies with each vegetable and where you live. There are both warm and cool season root crops, so you can look forward to yummy harvests throughout the year. For example, sweet potatoes, ginger and turmeric grow through the warm-hot months, whereas garlic and potatoes usually grow best with some cooler temperatures.

In my experience though, no matter where you live, there is an IDEAL time to sow and harvest ALL root crops.

“By timing your planting and harvesting in harmony with the correct moon phase, you can definitely reap rich rewards.” – Anne Gibson

What do I mean by that? Each month, there are days when the gravitational pull of the moon draws moisture DOWN in the soil into the root or underground storage part of the plant. At this time, seeds swell and germinate sooner, bulbs and tubers develop shoots faster and root systems grow more quickly. Unless you’ve done your own experiments, you may never have noticed this taking place!

Turmeric rhizomes shooting new leaves in harmony with the right moon cycle

Turmeric rhizomes shooting new leaves in harmony with the right moon cycle

This happens month in, month out, year after year.

If you only have a short growing season, getting your timing right can make the difference to whether you get a crop at all. If you work with nature though, you can swing things in your favour for a more successful outcome.

So, for example, if you want to sow beetroot seeds, seed potatoes or plant garlic cloves:

  1. Choose the right season for your local climate [See What to Plant and When for resources or if you live in SE Queensland, the Subtropical Planting Guide]; and
  2. Time your planting on a ‘root crop day’ according to the moon phase for that month. If you’re thinking “What?”, hang in there, I’ll explain!

Sowing Root Crops by the Moon

After the full moon each month, you’ll notice the moonlight decreases as the cycle returns to a new moon. This is when plant sap flow is drawn down, putting energy into the plant roots.  So what?

That’s when you should grab your bulbs, knobs of ginger, cloves of garlic, beet seeds and sprouting spuds and start planting!

Certified organic radish seeds for sowing microgreens

Certified organic radish seeds for sowing microgreens

I don’t bother at any other time of the month, because from countless past experiments, I know I just don’t get the best results. If I’m going to invest time and money to grow my food, I want it to succeed every time.

How many times have you sown seeds and they never germinated? Or planted potatoes or carrots and were disappointed? I get it. I’ve been there. But not anymore!

So here’s what I do. To find the ideal root crop days each month, I refer to a Moon Planting Calendar that makes it easy to find the best dates. I simply plan ahead what I’m going to sow or harvest accordingly.

Use a moon calendar to timing planting root crops for best results

This helps me plant my root crops like seed potatoes so they shoot quickly and establish into healthy plants

So if for example, the best dates for the month are the 7th, 8th, 14th and 15th, then I try to organize my seeds, potting mix and container so I can be ready to plant on one of these days. Rather than taking pot luck planting any time of the month, I PLAN and WORK WITH NATURE.

Harvesting Root Crops by the Moon

When I can, I also harvest on these ideal dates. Why? Because it can make a massive difference to how long root crops can be stored for. Maximizing storage life means you can extend your harvest.

Have you ever noticed your beetroot or onions become soft after a few days? Or noticed your garlic starts to shrink quite quickly after harvesting? It’s not so plump any more. If so, try harvesting on a ROOT CROP DAY.

Potatoes harvested on a root crop day store longer

Potatoes harvested on a root crop day store longer


I did an experiment to see how long my garlic bulbs would store for. The longest bulb lasted a year! Incredible. Check out the results in this video:



I’ve talked to so many people who’ve tried growing garlic and either had a complete failure, or success one year and disaster the next. They just can’t figure out why. Maybe you’re the same?

If so, it could have more to do with TIMING than you realise. Why not try using a Moon Calendar and working with nature to see the difference for yourself? What have you got to lose?


Perpetual Moon Calendar Planting Guide - a tool you can use for a lifetime

Perpetual Moon Calendar Planting Guide – a tool you can use for a lifetime

5 Top Tips for Picking and Storing Root Crops

  1. Root vegetables like radish, beets and carrots are sweetest when they are small. They can become ‘woody’ if left too long. Isn’t that perfect for impatient gardeners?
  2. Once you harvest your root vegies, remove the leaves (yes they are edible!) so the moisture stays in the root and is  not drawn back into the shoot.
  3. Store root vegetables like carrots and beetroot in your fridge crisper drawer or a box of moist sand.
  4. Potatoes, sweet potatoes and onions store best in paper bags in a dark cool drawer or pantry.
  5. If you don’t want to harvest all of your ginger or turmeric at once, leave them in the soil and just gently break off knobs as you need them.

So there you have it. Some of my best tips on growing root crops for a healthy harvest to heal and nourish your body. If you dig this article, please share the love!

Harvest of healthy root vegetables

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© Copyright Anne Gibson, The Micro Gardener 2017. https://themicrogardener.com. All rights reserved.

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