A Complete Guide to Creating a Vertical Strawberry Planter (Plus How to Overwinter Strawberries)

on November 14, 2019

Strawberries are one of the most popular plants to grow in a stackable GreenStalk Vertical Planter. They are relatively low maintenance and in most areas, you plant them once and they will come back year after year. Kids love growing strawberries and most importantly, harvesting strawberries. They are a great plant to grow and in this post we will detail exactly how to make your own vertical strawberry planter with minimal work.

Large strawberries grown vertically in a GreenStalk Vertical Planter

Another reason to grow strawberries vertically is that they are ranked really high on the “Dirty Dozen” list. In general, strawberries purchased from the grocery store are more likely to be high in pesticide residue. The great thing about growing them at home is that you control what you put on your plants and in turn control what you consume.

Prep that soil

Strawberries will be in that planter for a while. So choose a really high quality potting mix – you don’t want to go for the cheap stuff here. Purchase or make a lightweight fluffy mix that may include ingredients like peat moss, coconut coir, perlite vermiculite, compost, worm castings, etc. Stay away from wood chips, top soil and garden soil for container gardens. Strawberries also love an acidic soil, so if you’re concerned about the PH of your mix, you can get a meter for about $10 and check it a couple of times a year. Aim for a reading of 5.5-6.8 for strawberry plants.

Evie 2 strawberry plants growing in a classic terracotta GreenStalk Vertical Planter

Difference between Everbearing (Day Neutral) and June Bearing

Strawberries come in two basic types, everbearing and June bearing. Everbearing varieties will produce a smaller amount of strawberries for a longer period of time. June bearing strawberries will produce one large harvest for a short amount of time (about 6 weeks) then are basically done for the rest of the season.

We typically grow everbearing varieties and in our area (Knoxville, TN zone 7) that means a steady harvest of medium sized berries from about May thru October. Evie 2 from Nourse Farms has been a favorite of ours this season.

30 strawberry plants growing in a 5 Tier GreenStalk Vertical Planter

Consider your growing zone

Before purchasing, consider your growing zone and how hardy you want your plants to be. Strawberries need a dormant season so most varieties are perennial (come back year after year) in zones 3-8.

Plants in containers typically get a little colder than plants in the ground. It’s a great idea to get a berry that can handle a harsher winter since you’ll be growing these in containers. For example, if you’re in zone 5, look for a variety that can tolerate down to a 3 or 4 so you’ll have a buffer for the really cold weather.

Whatever variety you choose, be sure to place your stackable GreenStalk Vertical Garden in a spot that gets full sun – eight or more hours is ideal for strawberries.

Bare root strawberry plants ready to be planted

Plant your strawberries in the spring

We love getting plants in the bare root form because they are much more affordable but you could also buy from starter plants. Bare roots look a little scary when they arrive – they basically look dead. But they bounce back in just a few days. Be sure to follow the instructions of the package the bare root plants come in. The grower may recommend using your plants within a certain time frame or storing in the refrigerator until they can be planted.

We don’t recommend growing strawberries from seed since they take longer to grow and not everyone has that extra time in the season to wait for germination.

Be sure to plant only one strawberry plant per pocket (up to 30 plants per 5 Tier GreenStalk Vertical Planter) for best results. You’ll still get lots of berries, but it will give your plants the opportunity to grow big and strong. You can also plant just a few strawberries and plant the other pockets with vegetables, herbs or flowers – that’s the beauty of growing vertically with GreenStalk! We almost always prune the runners off the plants, but usually keep the blooms even in the first season of growth.

Bare root strawberry plant after a couple of days growth commonly referred to as “the crown”

Don’t bury the crown of the plant

Strawberries are very particular about how they are planted. Be sure to plant at crown level, but not covering the crown. Only bury the roots. See the photo above to see what your plant should look like right after planting. Both bare root and starter plants have a crown, so take care when planting.

5 Tier GreenStalk Vertical Planter in stunning stone

Fertilize when needed

Freshly planted strawberries don’t need any additional fertilization since most potting mixes come with a blend of starter fertilizers. Unless you are using a more sterile mix (like Pro-Mix), then you don’t need to worry about it until a couple of months after transplanting your berry plants.

A few times during each growing season (and at the start of the following season), we add an all purpose fertilizer to the soil either thru the GreenStalk’s watering system or by sprinkling in the pockets. We love to use organic worm castings in addition to a liquid fertilizer through the year.

Strawberries growing in a classic terracotta GreenStalk Vertical Planter

Water as needed

Strawberries don’t like the soil to be saturated with water all the time. Most gardeners will only need to water their berry plants 1-3x a week. Make sure to allow the soil to dry out some between watering. But whenever you do water your plants, be sure to fully saturate the soil. In the summertime, you may need to water more, so it’s always a good idea to check your plants daily or every other day to determine their watering needs.

Customer submitted photo of strawberry plants growing in a GreenStalk Vertical Planter

How to deal with pests and disease

From time to time you may deal with some pests and plant disease. Our best tip for reducing disease is to grow a variety with resistance. It makes a huge difference with perennial plants. Another thing to be careful of is overwatering, which can be easy to do with strawberries since they don’t need to be watered daily. For dealing with pests, we typically use organic neem oil for insect control and our bird net cover for keeping birds away from our ripening strawberries.

Strawberries and blueberry plants in the spring after overwintering in a GreenStalk Vertical Planter

Tips for overwintering

First, check your plant’s growing zone to find out how close your area is to the end of the range. If you’re in the middle to upper end of the growing zone range, you probably only need to water your plants every couple weeks in the winter for them to make it through to the next season. Plants will look dead in their dormant season, but that’s completely normal. They’ll make a comeback once the weather starts to warm.

If you’re growing in the colder zones like 3, 4 or 5, then you will want to take some precautions to ensure your plants have the best chance of making it through the winter. Some ideas are:

+ Move your GreenStalk Vertical Garden towards your home or other heated structure for protection against really windy winter days.

+ Use a frost net cover on cold nights to will help insulate the planter.

+ If you’re expected extreme cold weather, move your GreenStalk to an unheated garage or shed for a limited time. This is easier with the GreenStalk Mover.

Add straw to the top of the pockets to provide some additional protection.

+ Remember to water your plants until the winter cold freezes the soil solid.

+ Don’t worry about the GreenStalk Vertical Planter making it through the winter, we make it durable enough to last through the coldest winters and we back it with a 5 year warranty.

Even with the best winter care, there will be some plants that don’t make it. We typically get about 85-95% back year after year. Strawberry plants won’t last forever, but you should be able to get 3-4 years out of one planting. When the mother plants start to decline in berry production, you may consider placing the runners/baby plants in the pockets beside the mother plants. Once the runners root in, you can remove the mother plant.

Alpine strawberry plants in a 3 Tier GreenStalk Vertical Planter with a GreenStalk Mover

About Alpine Strawberries

If you’re looking for the sweetest ever bearing strawberries, Alpine is the way to grow. This variety is ideal for kids since you’ll have a large harvest of tiny berries (about the size of a large blueberry) every season!

Happy Gardening!

GreenStalk GrowerA Complete Guide to Creating a Vertical Strawberry Planter (Plus How to Overwinter Strawberries)

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