I did a grow in 2017, archived my tent, and then started growing again in 2021. My recollection is that the biggest changes in that four year gap were the movement away from blurple to white LED's and tent automation was just starting up at that time. It's a very different story for the changes from 2021 to 2025.
The plant is the same but there seem to be a lot more strains available. Autoflowers have improved and the disdain for them appears to be on the wane.
The biggest change is in the grow equipment. Covid money drove a lot of demand. That, coupled with the relentless march of technology, have driven an explosion of growth in the different categories of products and the number of products in each category.
Soil growers now have SIP's available to them (it's still soil but there's a shallow reservoir below the soil container which allows the roots to access nutrients more quickly and it increases water/nutrient uptake rates). More companies are offering bucket style hydro systems with good features and attractive prices. Blurples are long gone, HID still has a few adherents, and the grow light market is dominated by white LEDs with additional lights in UV, red, and far red (IR) bands. Many light manufacturers have come and gone. The level of automation has vastly increased in terms of functionality and quality. AC Infinity, a new player in the marketplace, with a large number of products and has lead the way with an AI-based controller that will adjust up to 32 devices to optimize the grow environment. The number of companies offering tent kits has expanded with Mars and Spider getting into the market. Nutrient manufacturers are still selling their…"wide range of products".
Despite the prohibition by the federal government here in the US, more research is available, with the most common topic being grow lighting (mostly the impact of spectrum and light levels), some of that research coming from outside the US, notably Canada, Holland, and Israel.
RIU has changed, no surprise. I used to think of it as a place where "they throw a lot of elbows" but that's been dialed back. And when a newbie asks "how much weed will I get", the chorus of "About a pound" has a lot fewer voices.
