Jackfruit may be the most labor intensive fruit in the world to eat: it’s recommended that you oil your knife and cutting board before cutting it open, and the “fruit” is mostly fiber, rind, and seed rather than edible fruit flesh. The white sticky sap is akin to glue and many washings with detergent are need to remove the residue from whatever it touches.
With all of that said, I’ve had a very easy time growing the very robust seeds. I incubated the seeds in a wet 87.5% sand 12.5% filtered clay soil mix (a very sandy loam) at 76-87 Fahrenheit, or 24-31 Celsius, for 7 days indoors. When I saw my first seedling on day 3, I thought that was a jackfruit seedling. I moved my pot outdoors on day 7 and kept spraying additional water on the surface and used plastic wrap to retain moisture on the top layer of sandy loam. 13 days later on day 20 I saw that what I thought was a jackfruit seedling actually wasn’t, because a real jackfruit seedling had germinated and 4 were following behind.
There was a brutal heatwave afterwards, followed by smoggy skies due to all the wildfire smoke along the entire West Coast of the United States. Nevertheless, my jackfruit seedlings grew at a very fast pace. On day 34 I decided to transplant what I realized was a black mission fig seedling to its own pot, and removed all but 2 of my jackfruit seedlings. I kept 3 jackfruit seedlings as backups in a separate pot, but I’m 100% confident that I won’t need the backup plants. I decided to fertilize the two seedlings (the first and last movers) I’m keeping with Miracle Gro and and vitamin powder to provide for all the macro and micronutrients plants need to grow. With sandy loam I have the benefit of watering as much as I want without ever fearing root rot due to lack of oxygen from organic material decomposition.