marigolds

Digging Deeper – Late Spring Gardening

“What is one to say about June, the time of perfect young summer, the fulfillment of the promise of the earlier months, and with as yet no sign to remind one that its fresh young beauty will ever fade.”
–  Gertrude Jekyll, On Gardening

This post is about late spring/early summer gardening tips and things to look for that may be showing up soon in your garden.

  1. Fertilizer

    Don’t forget water soluble fertilizers for container plants. Container plants are in a potting soil that do not contain enough nutrients for all season.  Depending on the plant, you will need to add fertilizer to the water or use a slow release fertilize like Osmocote. Follow directions of product and individual plant needs for fertilization. Top dressing containers with compost can also be done to add some nutrients.

  2. Boost for New & Established Plants

    Most in-ground soils will benefit from adding organic material like compost and a starting fertilizer like Biotone Starter before planting or Plant Tone after planting. Top dressing the established perennials/shrubs with compost in the spring will give them an extra boost of nutrients. Plants like butterfly bush, delphinium, and clematis like if you put a mound of compost around their root ball.

  3. Watering

    Newly planted plants in the ground need deep watering so their roots reach down and establish themselves before winter and reduces stress on the plants. Water deeply a couple times a week. If it rains a little (pay attention to how many inches you get with a rain gauge), you can water around your new plants a little more to get water deep into the soil. It helps you conserve water and save time watering. 1″ of water per week is the recommended amount of water. Pay attention to the soil and if it is wet looking, hold off for another day. Best method is to stick your finger in the soil and if it’s dry a couple inches down, it’s time to water.

  4. Weeding

    Remove weeds now while they are small, as they grow quickly. Weeding is easy when soil is damp since it’s easier to pull the whole plant including the roots. Be careful not to walk on soil around your plants to avoid compaction of the soil.

  5. Prevent Fungal Diseases

    With rain and warming weather you need to be proactive about fungal diseases. It’s best to prevent it, instead of treating it because once it starts, you can’t get rid of it completely. Treat your plants that have a higher chance of fungal issues with a fungicide before you see signs of it.  For example, tomatoes usually get blight so best to treat with Bonide Revitalize or Copper Fungicide before it starts. Make sure to water your plants at the base and water in the morning when possible so the water can dry before it cools off at night. Mulch around your plants as well to help prevent fungus from the soil splashing on your plants.

  6. Insect damage is going to start. Keep an eye on your plants for damage to their foliage. It’s important to remember, a little bit of insect damage is not bad and if you see an insect, it doesn’t mean they are bad. We need to move passed the thought that bugs are icky and nuisance. There are very important insects that are good for the garden and actually improve plant health.

    Look for these invasive species instead:
    Japanese Beetles: Metallic looking green/bronze beetles flying or munching on landscape plants. They love roses, hollyhock, cherry trees, plums, grapes, blackberries, and linden trees. They can be found snacking on other plants as well. Read more about them hereIncorporate plants that repel Japanese beetles such as catnip, chives, garlic, nasturtium, and white geranium around your susceptible plants. Jumping Worms: Although we haven’t had any recordings of jumping worms in our area, these can be very detrimental to lawns and gardens. There are sightings of these worms in the Minneapolis/St. Paul area so if you are doing any transplanting of plants from that area, purchases of mulches and soils, or any plant swap around our area. Read more about them here so you can know what to do to avoid them or if you see them, how to alert the U of MN Garden Extension. There are no proven ways to eradicate these worms yet.

Getting rid of insects isn’t always easy and great care should be taken if you choose to spray with insecticides, even ones labeled organic. It’s still an insecticide made to kill insects.

*Quick side note about fungus since we have been having cool springs the last couple years. With cool/wet weather you may encounter anthracnose on your plants. If you are seeing brown spots on trees and shrubs early in the spring it may be this.

shamrock plants and iron cross

Shamrock Plants – Luck’o the Irish!

This post is dedicated to the lucky Shamrock Plant! The official plant of St. Patrick’s Day!

Oxalis Info

Let’s start with its scientific name, Oxalis regnellii. These plants are part of the wood sorrel family, Oxalis, and you can even see other cultivars in the wild that are hardy in MN. For example, Oxalis stricta (Yellow Wood Sorrel) is a native wildflower. They look very similar to Trifolium repens L., the White Clover, which is the true shamrock plant. White Clover is a beneficial pollinator plant and soil nitrogen fixing plant, as well as ornamental interest with its cute blooms.

The ornamental Shamrock Plant you see blooming in late winter in garden centers is known as the false shamrock because of the similarities of the three heart-shaped leaflets of clover, it’s tiny colorful blooms, and it being a perfect plant for St. Patrick’s Day!

Oxalis typically grow to around 6″ tall and can grow quickly. The leaves will open and close according to the light throughout the day, called nyctinastic movement. The leaf colors vary between cultivars and typically the burgundy and green varieties are seen in garden centers.

Another plant you will see often is Oxalis tetraphylla, the Iron Cross (Good Luck Plant).  These plants have four leaflets, that are green with a dark purple blotch at the center.  When you can’t find a four-leaf clover in the wild, just get yourself a whole plant with four leaflets!

 

How to Grow Oxalis

The Oxalis plant grows from rhizomes ( like a bulb ) in the soil. A big difference between these and other houseplants is that it can go dormant in the summer. Other ways that may promote dormancy is if the soil is dried out too many times, the inside temperature gets too cold, or it doesn’t receive enough sunlight. We will cover dormant care after the basic care of oxalis.

 

Light

After you pick out your Shamrock Plant and bring it home, put it in bright indirect light. It can take full bright light during the winter months in the morning. The bright light will promote more blooms. Speaking of blooms, these plants are known to bloom on and off all winter and one of the easiest plants to bloom! Too dark and your plant may not bloom. It may also go into dormancy.

 

Watering

The soil of your plant should be lightly moist at all times. You can let the top of the soil dry before watering. Frequency will depend on the humidity of your home, size of the plant, and container it’s in. If you let it go completely dry multiple times it may signal to the plant that it needs to go into dormancy. If you water it again after it goes completely dry and the foliage keeps dying back, let it go into dormancy to avoid rotting the rhizomes.

 

Dormancy

As stated above, your plant may go into dormancy and is likely at some point during its life.  If the rhizomes are not soft and squishy, an indication of over-watering, your plant is just taking a rest. Dormancy can last a few weeks to a few months depending on the environment and variety.

Clean up the dried up foliage and stop watering and put the pot in a cool dark place. The plant will naturally want to come out of dormancy when it’s ready. If it’s been dormant all summer or for a few months, you can bring it out to the light, give it a little water and it should promote new growth! Some people have been successful by letting it go dormant only a few weeks and then bringing it back out to the bright light.

Be sure the soil doesn’t get soggy before the foliage starts popping out because it could rot the rhizomes. You should start seeing new foliage in no time with the sunlight and light watering!

 

Now that you know more about the Shamrock Plant we hope you give it a try! It’s a fun plant to gift for a little luck during the late winter and for St. Patrick’s Day!

 

 

 

 

 

 

 

 

 

annual yellow sunbelievables and annual plant container

Annual Flower & Plant Care

  • Annual Flower & Plant Care
    July 25, 2019
    5:30 pm - 6:30 pm
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Event Phone: 507-388-4877

Get detailed care instructions for multiple varieties of annual flowers and plants!