09/06/2026
Luffa! Part 1 of 3: General Info and germination tips
Seeding Tips / Plant of the Day
The sponge people use in the shower is actually a gourd but did you know you could eat it too?
That’s the main reason I grew it this year. I didn’t really care about growing a sponge, I wanted to grow them to eat them. I had heard they are similar to a zucchini - which I love!😋
Something to note is that they take a long time to mature.
Start early! Days to harvest is 100-140+ for mature sponges but only 50-60 days for green culinary harvests (eating them).
People tell me they start in January…. I didn’t and can’t imaging how big they would be if I did! I started my first crop mid March.
From start to finish. Well, almost finish. I have left one to mature on the vine.
Seeding:
So they are not the easiest seeds to germinate. They require scarification. The seeds have a very hard, thick outer coating that keeps water and air out. You have to break that coating. I used a piece of sand paper and rubbed the edge until it was soft. Some of them I broke through to the gap between the embryo and shell. Germination didn’t seem to be affected by how deep I went. Just don’t damage the embryo or the radicle (the part of the embryo that the root comes from). The radicle is on the pointy end of the seed, so avoid doing anything to that end.
They also germinate better with soaking overnight, don’t soak too long as that can rot the seed.
Temperature: they require high temperatures to germinate faster. Heat mats set to 30’C are very helpful. Top shelf of my grow room is around 26’C and is still not enough for fast germination. That said some seeds will germinate in a few days while others will take weeks. Germination rates have not been great for me. I typically get 99-100% germination rates for seeds, these were closer to 60-70% 😞
Once they germinate it’s really important to have high light levels or they’ll stretch. They grow super fast in high heat and slow down in 20’C. I kept them low (cooler) in my grow room to keep them from growing fast as I have limited space in the spring. I also trimmed most of the vines once they got about a foot long, to save space and keep them from getting tangled.
Next post:
Hardening off!
I do have seeds available now and plan to start more plants next spring.
If you want a sponge, message me and I’ll make note of it so I can let you know when they are ready.
I hope you have enjoyed reading about my experiences and my tips. For more seeding tips on various kinds of plants search my page for “Seeding Tips.”
More information posts can be found by searching for “Plant of the day”/“PlantOfTheDay”
Thanks for supporting local small businesses 💜
Together, we grow! 🌱🌸🐝🍓
, ,