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How long should I wait when the seeds don’t sprout?
When you plant vegetables, you can’t help wondering when they will sprout. If the buds do not come out at the right time as described in the information on the internet or in the book, then there is great worry.
So how long should we wait?
The average number of days to sprout depends on the type of vegetable and the temperature, but basically all vegetables sprout within 3 to 7 days. In rare cases it can germinate after 10 to 14 days, but if it takes longer than that, it is better to re-seed. If you wait too long, you may miss out on the right time to sow, so in that case skip early and sow again.
7 reasons why seeds don’t sprout
There are many reasons why seeds may not sprout, but here are 7 reasons that beginners growing vegetables need to take special note.
1) Drainage (half watering)
We all know that water is needed when germinating. When the seed contains water, the germination switch will be turned on. For a while after turning the switch on, if there is not enough water in the soil, it will die along the way. Be careful, especially for small growers, as the water drains quickly. It is not necessary to dry in direct sunlight until germination, so keep in a shady place to avoid drying out the soil.
As I wrote in the article “Better not to water the field!?”, It is better not to water the field even when sowing the seeds. Unless it doesn’t rain for a few weeks, let rain take care of the amount of water needed for the seeds to sprout. When a large amount of water poured down at the same time like rain, the water was held steady until it took root after the germination switch was turned on, but since the artificial water amount is known, until it has properly rooted. It is difficult to guarantee moisture’s. If you really want to water, do so until the water is deep and solid.
2) Excess water
This is more likely to happen in growers, but over watering can prevent plants from sprouting. If the soil is too moist, the seeds will not be able to breathe well. After watering a lot at once, it is better to leave it as is unless the soil is dry.
3) Too much soil
There are two main reasons why it does not germinate because the soil is covered. First of all, the seeds have difficulty breathing due to covering too much soil as before. Another reason is that some vegetables need light when they sprout. The type with this characteristic is called photophilic seed, and carrot, cub, komatsuna, mizuna, lettuce, strawberry, perilla, basil, etc. correspond to this category. The filling soil layer should be about 0.5 cm to 1 cm thick.
4) The land is not covered
In contrast, there are particles that do not like light. Typical examples are radish, eggplant, chili, tomato, pumpkin, cucumber and onion. This type is often used for fruits and vegetables. Considering that in the natural world, the fruit ripens, falls and germinates from the inside, so when it sprout it is conceivable that light does not appear to be bright. Cover the seed about 2 cm above the soil.
5) Seed lifespan has expired
Seeds live with minimal energy until they are placed in an environment where they can germinate. However, like other organisms, when the lifespan ends, they use up all their energy and stop sprouting. Its shelf life varies depending on the type of vegetable and the storage environment. Basically, avoiding high temperatures and humidity and storing in the refrigerator, etc. will not shorten the lifespan. It is said that many seeds are sold on basically more than a year after they are collected, so consider when to use up.
Perennial seeds (5 years or more): tomato, eggplant, watermelon, etc.
Permanent seeds (3-4 years): turnip, cucumber, pumpkin, morning glory, lettuce, green beans, etc.
Short-term seeds (1-2 years): onions, onions, carrots, peanuts, etc.
6) There is a problem with the soil
If the fertilizer composition in the soil is too rich, or if immature compost that smells like ammonia or musty is used, the seeds may not germinate. Take care not to overfill and avoid using immature compost. If you want to use it, mix it with the soil and wait for 2-3 weeks before sowing or planting.
7) Soil temperature is too low or too high
Seeds have an optimal temperature for germination, and they do not germinate unless they have the right soil temperature (soil temperature). Be careful, especially in the case of plants, as soil temperatures can change easily. Here is a guide to the optimal temperature for germination.
20-30 degrees Tomato, eggplant, pepper, cucumber, pumpkin, ginger, sweet potato, etc.
15-25 degrees spinach, lettuce, peas, soramame, onion, chamomile, carrot, potato, etc.
This time, I have introduced 7 points regarding germination. Take note of these seven at the stage of sowing and preparing the germination medium.
Illustration: Souya Hashiguchi
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