{"id":13395,"date":"2021-10-09T17:54:22","date_gmt":"2021-10-10T00:54:22","guid":{"rendered":"https:\/\/gregalder.com\/yardposts\/?p=13395"},"modified":"2021-10-09T17:54:25","modified_gmt":"2021-10-10T00:54:25","slug":"comparing-my-compost-and-recipe-420-for-starting-vegetable-seeds","status":"publish","type":"post","link":"https:\/\/gregalder.com\/yardposts\/comparing-my-compost-and-recipe-420-for-starting-vegetable-seeds\/","title":{"rendered":"Comparing my compost and Recipe 420 for starting vegetable seeds"},"content":{"rendered":"\n

Can I find a mix that grows vegetable starts better than my homemade compost?<\/p>\n\n\n\n

For years, I’ve been growing my vegetable seedlings in compost that I make at home, but I’ve desired to discover whether another mix might work better. I want to grow the fastest, strongest vegetable plants.<\/p>\n\n\n\n

So last month\u00a0I started an experiment\u00a0comparing my compost to the most expensive, most lauded potting soil on the West Coast.\u00a0Recipe 420 Potting Soil<\/a>\u00a0is made by E.B. Stone up in Northern California. It cost me $17 for a single 1.5 cubic-foot bag of the mix purchased at a local nursery.<\/p>\n\n\n\n

Here is the bag of Recipe 420:<\/p>\n\n\n\n

\"\"<\/a><\/figure><\/div>\n\n\n\n

Here is what the Recipe 420 mix looks like:<\/p>\n\n\n\n

\"\"<\/a><\/figure><\/div>\n\n\n\n

And here is what my compost looks like:<\/p>\n\n\n\n

\"\"<\/a><\/figure><\/div>\n\n\n\n

Comparing the two, my main impression was that my compost felt denser and heavier. The Recipe 420 product felt very light, full of air, and fluffy.<\/p>\n\n\n\n

<\/div>\n\n\n\n

What are they made of?<\/strong><\/p>\n\n\n\n

The Recipe 420 label:<\/p>\n\n\n\n

\"\"<\/a>
Note that coir, spaghnum peat moss, and pumice are all airy, light materials.<\/figcaption><\/figure><\/div>\n\n\n\n

The label also says that a number of bacteria and fungi are added to the mix.<\/p>\n\n\n\n

My compost is made of food scraps from our kitchen, garden scraps, wood chips, chicken manure, and a bit of dirt. It’s just stuff from our kitchen and yard, thrown into our chicken pen and mixed together and cool-composted over the course of a few months.<\/p>\n\n\n\n

<\/div>\n\n\n\n

Starting the experiment<\/strong><\/p>\n\n\n\n

On September 14, I sowed a 72-cell tray with Recipe 420 and a 72-cell tray with my compost using exactly the same seeds. The seeds were onions (Red Rock, White Castle, Madalyn), kale (Winterbor), broccoli (Imperial), cabbage (Storage No.4), romanesco (Vitaverde), cauliflower (Snow Crown), collards (Top Bunch), lettuce (Coastal Star, Flashy Trout Back), zinnias, and cilantro.<\/p>\n\n\n\n

I wanted to learn which mix got the seeds to germinate faster and which produced faster growth\u00a0after germination. I was also looking for which mix made the healthiest looking seedlings (vibrant green leaves, no discoloration on the margins). And I would look for how large and broad the root systems were within each mix.<\/p>\n\n\n\n

What do you predict?<\/p>\n\n\n\n

<\/div>\n\n\n\n

Speeds of germination<\/strong><\/p>\n\n\n\n

By September 21 (one week from sowing), it became clear that the seeds of all types were germinating faster in the Recipe 420 mix. As you can see in the White Castle onion sets, most seeds in the Recipe 420 mix had germinated before even one seed in my compost had.<\/p>\n\n\n\n

\"\"<\/a>
My compost on left; Recipe 420 on right.<\/figcaption><\/figure><\/div>\n\n\n\n
<\/div>\n\n\n\n

Rates of growth<\/strong><\/p>\n\n\n\n

Five days later, on September 26, most seeds in my compost had germinated and some were beginning to grow true leaves, but the plants in the Recipe 420 mix were almost all bigger than their counterparts in my compost.<\/p>\n\n\n\n

\"\"<\/a>
September 26, 12 days after sowing; Recipe 420 on left, my compost on right.<\/figcaption><\/figure><\/div>\n\n\n\n

Unfortunately, at about this time I lost some seedlings in the bottom row (lettuces, zinnias, and cilantro). It looked like an insect munched the emerging leaves, thereby killing the plants. And it happened mostly to the sets in my compost — the lower right section in the photo above. So from that point on, I disregarded the growth of those sets in my evaluations.<\/p>\n\n\n\n

<\/div>\n\n\n\n

Experiment concluded<\/strong><\/p>\n\n\n\n

On October 5, some seedlings were large enough to be put in the garden ground so I took some final photos and made some final observations. All seedlings grown in Recipe 420 were bigger at this point.<\/p>\n\n\n\n

\"\"<\/a>
October 5; Recipe 420 on left, my compost on right.<\/figcaption><\/figure><\/div>\n\n\n\n

How much bigger were the seedlings grown in Recipe 420? I estimated that they were a couple days to a week ahead, and this turns out to be about the difference in the dates of germination. My conclusion was that the plants grew at the same speed in both mixes, but because they got started earlier in Recipe 420 they ended up bigger.<\/p>\n\n\n\n

How about the appearance of the plants? I saw no difference. Both looked a deep green with no discoloration on their leaves. They all appeared to be in vigorous health.<\/p>\n\n\n\n

\"\"<\/a>
Imperial broccoli seedlings: Recipe 420 on left, my compost on right.<\/figcaption><\/figure><\/div>\n\n\n\n

As for the root systems, as expected, the bigger (older) plants grown in Recipe 420 had more roots. But were the roots broader or better in any way? Not obviously, although this was hard to discern because the Recipe 420 mix contains white bits of pumice that are the same color as the roots, making the rootball seem whiter and fuller of roots. <\/p>\n\n\n\n

\"\"<\/a>
Imperial broccoli seedling roots: Recipe 420 on left; my compost on right.<\/figcaption><\/figure><\/div>\n\n\n\n

Regardless, in the end, Recipe 420 performed better than my compost at starting vegetable seeds and growing them up to transplant size. Recipe 420 is the winner!<\/p>\n\n\n\n

<\/div>\n\n\n\n

Cause\u00a0of\u00a0difference in germination speed<\/strong><\/p>\n\n\n\n

Now I was curious as to why Recipe 420 engendered faster germination. My guess is that the\u00a0magic was in its lightness and fluffiness. Tiny vegetable seeds don’t have the strength to easily push up a heavy roof overhead when they are ready to grow.<\/p>\n\n\n\n

<\/div>\n\n\n\n

How to improve my compost<\/strong><\/p>\n\n\n\n

To improve the speed at which vegetable seeds germinate in my compost, I should modify a few things. I should sow the seeds shallowly (make the “roof” thin), incorporate less dirt (which is heavy) into the mix, and incorporate more light materials such as leaves.<\/p>\n\n\n\n

Further, when filling the cells with my compost, I should leave the mix fluffier; I have been in the habit of using my fingers to compact the compost down into each cell before sowing.<\/p>\n\n\n\n

<\/div>\n\n\n\n

What’s next?<\/strong><\/p>\n\n\n\n

Since I’ve found a product that grows better vegetable starts than my homemade compost, why don’t I just abandon my compost and use the superior Recipe 420? I might. But I love to learn and discover so what I’m more inclined to do is tinker with my compost recipe to try to improve its efficacy.<\/p>\n\n\n\n

As for you, if you don’t already have a vegetable seed-starting mix that you’re convinced is the best, I recommend trying E.B. Stone’s Recipe 420.<\/p>\n\n\n\n

<\/div>\n\n\n\n

My previous seed-starting posts:<\/p>\n\n\n\n

Experiment comparing composts for vegetable seed starting<\/a><\/p>\n\n\n\n

Can you start vegetable seeds in compost?<\/a><\/p>\n\n\n\n

Adding soil and compost to seed-starting mixes<\/a><\/p>\n\n\n\n

<\/div>\n\n\n\n

All of my Yard Posts are\u00a0HERE<\/a><\/strong><\/p>\n","protected":false},"excerpt":{"rendered":"

Can I find a mix that grows vegetable starts better than my homemade compost? For years, I’ve been growing my vegetable seedlings in compost that I make at home, but I’ve desired to discover whether another mix might work better. I want to grow the fastest, strongest vegetable plants. So last month\u00a0I started an experiment\u00a0comparing […]<\/p>\n","protected":false},"author":2,"featured_media":13404,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_et_pb_use_builder":"off","_et_pb_old_content":"","_et_gb_content_width":"","_jetpack_memberships_contains_paid_content":false,"footnotes":""},"categories":[33,30],"tags":[41],"class_list":["post-13395","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-soil-and-fertilizer","category-vegetables","tag-compost"],"yoast_head":"\nComparing my compost and Recipe 420 for starting vegetable seeds - Greg Alder's Yard Posts: Southern California food gardening<\/title>\n<meta name=\"description\" content=\"Can my homemade compost grow vegetable starts as well as Recipe 420 -- the most expensive mix a gardener can buy?\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/gregalder.com\/yardposts\/comparing-my-compost-and-recipe-420-for-starting-vegetable-seeds\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Comparing my compost and Recipe 420 for starting vegetable seeds - 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