DLI Calculator (Daily Light Integral)

Gardeners growing under lights are starting to understand how important DLI is to their growing environment. References to K levels and distance from bulbs are long gone. These values are obsolete, especially when using LED lights to grow plants.

Now it is all about DLI, the Daily Light Integral. Get that right, and you can grow some great plants.

The problem is that DLI requires you to do some calculations, which nobody wants to do. That is why I developed a FREE DLI Calculator.

  • Gardeners need to start using DLI to describe their lights.
  • It is easy with the DLI Calculator

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Best Temperature for African Violets

African violets have a reputation for being cool-growing plants, but is that really true?

More importantly, how warm can they get and still grow properly? Let’s have a look at the science.

Watch the YouTube version of this blog: https://youtu.be/IrbHvZmiHFo?list=PLUQee4Qv16_g

  • African violets are not cool-growing plants.
  • They will grow fine in most homes.

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Difference Between Compost and Vermicompost

Composting and vermicomposting are two methods that both create decomposed organic matter but there are differences both in the methods that are used to make it and in the final product. It is important for gardeners to understand the differences. This post will discuss both the products and the methods used to make them. This will help you decide which method to use or which product to buy.

split screen, left shows compost pile, right is a hand holding worms
Difference between composting and vermicomposting, source: Mizzou CAFNR

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Fertilizer Accumulation in Containers: Potential Plant Death

When it comes to adding fertilizer to pots and containers, gardeners talk a lot about fertilizer types and concentrations, but they rarely discuss the elephant in the room. What happens to fertilizer after it’s added to a container?

  • Do the salts build up over time?
  • How do different watering methods affect the real-time concentration of fertilizer in pots?
  • How critical is flushing?

All of these questions will be answered in this post.

Watch the video version of this blog post: https://youtu.be/WcFEgU5cq9A

  • Top watering is the least likely method to cause salt buildup.
  • Bottom watering is the most likely to harm plants.
  • Wick watering concentrates salts in the pot.

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Best Way to Propagate African Violet Leaves

Propagating African violets from leaves is both easy and a lot of fun. If you have never tried it, you really should. It is one of the coolest things in nature.

If you research the topic a bit, you will find several ways to propagate African violets from leaves, with no evidence as to which way is best. I decided to try several methods and compare the results to determine “the best way”. Here is what I found.

To watch the video version of this post, click: https://youtu.be/czuPJQI9RXQ

  • All the methods produce babies, but they are not all equal.
  • The water method was fastest.
  • A split leaf produces the most babies.

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Best Pot Size for African Violets

What is the correct pot size for African violets?

The 2019 May- June issue of the African Violet Magazine clarified this by stating, “pot size should be 1/3 the diameter of the plant”. This is repeated on numerous sites providing growing information, including the African Violet Society of America, and it is stated almost daily in African violet Facebook Groups.

If a plant shows any signs of decline or problems and is in a pot larger than 1/3 the diameter, owners are immediately told to repot it into a smaller pot.

That advice and the 1/3 rule are incorrect.

Watch the video version of this blog post: https://youtu.be/03mihVFxkKA

  • The 1/3 pot size recommendation for African violets is wrong.
  • Taller pots are drier than shorter pots.

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Wick Watering: How It Works & Common Myths

Wick watering is a fairly popular way to water houseplants. The initial setup is more complicated, but once a pot is set up for wicking, you spend less time watering your plants.

This post looks at the underlying science and uses that information to debunk some common myths about wick watering.

Watch the video version of this blog post: https://youtu.be/D7WEMqPPAYw

  • The size of the wick does not affect the moisture level in a pot.
  • The wick can’t make the potting media too wet, but the technique can produce pots that are too wet for plants.

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Best Watering Method for Houseplants: Top, Bottom, Wick, or Self-watering Pots?

There are four basic ways to water a houseplant: from the top, from the bottom, with a wick system, or with self-watering pots. Which is best? What are the pros and cons of each method?

Let’s look at the science behind each method to see whether they work and which plants actually prefer each one.

Top Watering, Source: Depositphotos

Watch the video version of this post: https://youtu.be/E8m2Aoh5ClQ

  • All 4 methods work if used correctly
  • Match the method to your environment and habits.

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Is Arsenic in Rice a Real Health Risk?

If you scroll through online health forums, social media, or sensationalized health blogs, you have likely seen alarmist headlines claiming that a humble bowl of rice is poisoning you with toxic heavy metals. Some claim you should cut rice out of your diet entirely, while others insist that organic rice is somehow immune to soil contaminants.

Internet health claims are often rooted in a kernel of truth that gets blown entirely out of proportion. Letโ€™s skip the fear-mongering and look at what actual scientific research tells us about arsenic levels in rice.

To watch the video version of this post, watch: https://youtu.be/oZOSkMTUCN4

  • Rice does contain arsenic.
  • Selecting the Right Rice and cooking it properly limits your exposure.

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Should You Eat Potato Skins?

Many people believe that all of a potatoโ€™s nutrients are locked inside the skin, while others believe that potato skins have no nutritional value. And then there is the belief that potato skins are toxic, especially the green ones.

What is the real truth about potato skins? Should you be eating them?

Watch the YouTube video for this post: https://youtu.be/YqFsoPH434c

  • Normal potato skins are safe to eat, but green ones are not.
  • Potato skins are nutritious, but what about sweet potatoes?

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Urea vs Nitrate in Fertilizer

Most fertilizer sold to gardeners uses urea as the nitrogen source, but most commercial greenhouses use nitrate as their main nitrogen source. Why?

I have been spending time in the African violet (AV) community, and most growers, including the African Violet Society of America (AVSA), recommend using nitrate rather than urea. But Schultz African violet fertilizer is very popular in this group, and it is mostly urea. In a test reported on by AVSA of the top AV fertilizers, one used only urea, and the other used no urea. A prominent breeder stated: “Iโ€™ve used fertilizer containing urea for nearly 30 years“.

I have used urea-based fertilizer for 50 years on all kinds of houseplants, and it seems to work, though recently some of my streptocarpus seedlings may be showing yellow leaves. It is time to understand the urea vs nitrate controversy in more detail.

Watch the video version of this blog: https://youtu.be/YdY5S7RUKMo

This post uses affiliate links

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The End of Japanese Beetles?

Every summer, gardeners across North America brace themselves for the inevitable green-and-copper invasion. The Japanese beetle (Popillia japonica) arrives like clockwork in late June or early July, stripping rose bushes to lace, skeletonizing fruit trees, and turning prized hibiscus plants into ragged remnants.

Over the decades, gardeners have tried everything to fight back. Weโ€™ve hung yellow traps (which actually draw more beetles into your yard than they catch), sprayed chemical insecticides, dumped milky spore on lawns, coated leaves with diatomaceous earth, and spent endless mornings hand-picking beetles into buckets of soapy water.

Yet, year after year, the beetles return.

But now there is hope. A very tiny parasitic fly might save your sanity and your garden plants.

Is this truly the end of Japanese beetles? Or is it just another gardening myth wrapped in overhyped enthusiasm?

Letโ€™s look at the actual science behind this predator, how it works, its history, and what it realistically means for your garden.

To watch the video version of this post, click on: https://youtu.be/1FVVW9AKXLM

  • Winsome fly will help get rid of Japanese beetles.
  • Learn to ID their eggs so you don’t destroy the wrong beetles.

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