Storm628
Greenhorn
Pierre sells a lot of interesting crops in summer. 1 blueberry plant turns a 80g seed in about 600g of profit with 40 farming experience. This isn't too bad, but if you're willing to do a bit more processing, you could do better.
Melons
Let's start with an easy one: 2 rounds of melons and 1 round of wheat, where you harvest the wheat on the first day of fall. A melon seed also costs 80g and a melon jelly will give 470g profit without artisan and 690g with artisan. So getting in two melon harvests will at least make you 940 per tile. In terms of experience, 2 melons and 1 wheat will give 60xp. So if you're limited on sprinklers, this makes better money per tile.
Wheat with rain
Speaking about being limited by sprinklers, did you know that wheat can grow with natural rain in summer? Summer has three guaranteed rainy days, namely the green rain and day 13 and 26. The chance for another rainy day is about 1-0,85^22 = 97%. So if you have some area of your farm cleared out, but no sprinklers to fill it (yet), you could fill it wit a bunch of wheat. The seeds are cheap and easily harvestable with a scythe. If you plan to expand your crop field there, you can plant the wheat in your favorite sprinkler pattern, making the ground ready to go for fall.
Selling wheat raw isn't really profitable, so what else can you do with it? The first thing that may come to mind, is to put it in a keg. This will turn your 10g seed in a 200/280g beer in a bit over a day. Another option is to build a mill. This is especially interesting if you planted a lot of wheat. The wheat flour can be cooked into bread, which sells for 60g each or can be used as an energy source. A mill can be quite expensive and doesn't have a lot of other uses, so I would only recommend this if you planted at least 300 wheat.
The last option is for the ancient fruit lovers out there: putting wheat into a seed maker. This isn't profitable, but you have a 1 in 200 chance that this will give you an ancient seed. Wheat seeds sell for about 25g less than the wheat itself, so you're essentially paying 5000g for an ancient seed.
The one thing that brings wheat down a bit, is the experience it gives, at only 6xp. It can be a nice bonus, and if you're willing to spend the first few days of summer getting hundreds of wheat into the ground, you may see some farming levels from this.
Hops
A crop that does give amazing experience per tile, is hops. With 17 harvest of 6xp each, one hops starter will give 102 farming experience. This is better than planting two rounds of starfruit, which gives 2*43 = 86 experience. And speaking of better than starfruit, 17 pale ale will gieve 7080 profit, while 2 starfruit wine will only make you 5500. This may require a ton of kegs and harvesting, but if you just want to make hops more profitable than blueberries, making 2-3 pale ale will be enough.
Hops can also be a good option to put into seedmakers for an ancient seed, even making a small profit if you use normal quality hops. The higher quality hops heals a good amount, making it more interesting for eating than selling, if you're short on kegs.
The daily harvesting may not be for everyone and because hops is a trellis crop, you may need to place your sprinklers with some extra space to reach all the crops. If you're in the late game, all of this can be negated by using junimo huts. They don't mind the daily harvests and can walk through trellis crops. They may skip the rainy days, but as hops starters are very cheap, I wouldn't worry too much about them missing a couple of harvests.
Melons
Let's start with an easy one: 2 rounds of melons and 1 round of wheat, where you harvest the wheat on the first day of fall. A melon seed also costs 80g and a melon jelly will give 470g profit without artisan and 690g with artisan. So getting in two melon harvests will at least make you 940 per tile. In terms of experience, 2 melons and 1 wheat will give 60xp. So if you're limited on sprinklers, this makes better money per tile.
Wheat with rain
Speaking about being limited by sprinklers, did you know that wheat can grow with natural rain in summer? Summer has three guaranteed rainy days, namely the green rain and day 13 and 26. The chance for another rainy day is about 1-0,85^22 = 97%. So if you have some area of your farm cleared out, but no sprinklers to fill it (yet), you could fill it wit a bunch of wheat. The seeds are cheap and easily harvestable with a scythe. If you plan to expand your crop field there, you can plant the wheat in your favorite sprinkler pattern, making the ground ready to go for fall.
Selling wheat raw isn't really profitable, so what else can you do with it? The first thing that may come to mind, is to put it in a keg. This will turn your 10g seed in a 200/280g beer in a bit over a day. Another option is to build a mill. This is especially interesting if you planted a lot of wheat. The wheat flour can be cooked into bread, which sells for 60g each or can be used as an energy source. A mill can be quite expensive and doesn't have a lot of other uses, so I would only recommend this if you planted at least 300 wheat.
The last option is for the ancient fruit lovers out there: putting wheat into a seed maker. This isn't profitable, but you have a 1 in 200 chance that this will give you an ancient seed. Wheat seeds sell for about 25g less than the wheat itself, so you're essentially paying 5000g for an ancient seed.
The one thing that brings wheat down a bit, is the experience it gives, at only 6xp. It can be a nice bonus, and if you're willing to spend the first few days of summer getting hundreds of wheat into the ground, you may see some farming levels from this.
Hops
A crop that does give amazing experience per tile, is hops. With 17 harvest of 6xp each, one hops starter will give 102 farming experience. This is better than planting two rounds of starfruit, which gives 2*43 = 86 experience. And speaking of better than starfruit, 17 pale ale will gieve 7080 profit, while 2 starfruit wine will only make you 5500. This may require a ton of kegs and harvesting, but if you just want to make hops more profitable than blueberries, making 2-3 pale ale will be enough.
Hops can also be a good option to put into seedmakers for an ancient seed, even making a small profit if you use normal quality hops. The higher quality hops heals a good amount, making it more interesting for eating than selling, if you're short on kegs.
The daily harvesting may not be for everyone and because hops is a trellis crop, you may need to place your sprinklers with some extra space to reach all the crops. If you're in the late game, all of this can be negated by using junimo huts. They don't mind the daily harvests and can walk through trellis crops. They may skip the rainy days, but as hops starters are very cheap, I wouldn't worry too much about them missing a couple of harvests.