Ph level

Use this area to discuss garden prep, soils, composting, and other related topics.

Moderator: Chris_W

User avatar
BackerBunch
Posts: 42
Joined: Mar 15, 2010 4:11 pm
USDA Zone: 7a

Ph level

Post by BackerBunch »

What is the best ph level for hostas? When I Googled it, one place said between 5.5 & 6.5. Another place said between 6.5 & 7.5. Does it depend on the type of hosta? Or it's color?
Brenda

JJ, Jake and Josie
Image
User avatar
Chris_W
Administrator
Posts: 8465
Joined: Oct 05, 2001 8:00 pm
USDA Zone: 9
Location: Co. Roscommon, Ireland
Contact:

Re: Ph level

Post by Chris_W »

Hi Brenda,

Most hostas are fairly tolerant of different pH levels, so long as it isn't too high. If the pH gets too high (higher than 8) then many of the nutrients in the soil become insoluble in water, meaning that the plants simply can't draw up nutrients into their roots after it rains. Some plants make do with what they get, but others won't tolerate those conditions.

It is best to have slightly acidic conditions (under 7.0), but most plants won't be affected by a pH a little over 7 (slightly alkaline conditions).

If you ever hear that a hosta needs "lots of water" to perform well, this could really be a plant with an eating disorder that doesn't feed well. Tattoo and Great Expectations come to mind as plants that need to constantly feed and do not tolerate high pH conditions. Many of the really big plants are like this too, like Mr. Big.

Tattoo is related to Little Aurora and I think that whole family of plants, Little Aurora, Tattoo, Little Sunspot, and Sultana, needs to have a low pH level to do well. Those plants all grew really well for me at our old place where we had dry conditions but low pH. When we moved here where the pH is very high but ironically the soil is fairly wet, that group of plants actually dwindled away.

We work Hollytone fertilizer and lots of compost into our soil when we plant. The compost we get from the city of Ann Arbor has a pH that is almost neutral, however it is low in sulfur, which the Hollytone has added to it. Sulfur gets eaten by soil bacteria, turning it into Sulfuric Acid which in turn lowers the pH. It is a slow process, but in time our pH is coming down here, and the hostas are all starting to grow bigger, faster.

Hope that helps :)

Chris
Image
User avatar
BackerBunch
Posts: 42
Joined: Mar 15, 2010 4:11 pm
USDA Zone: 7a

Re: Ph level

Post by BackerBunch »

Thank you, Chris! That actually helped a lot. We live on a hill that is nothing but red dirt but we've bought some compost from the city of Charlotte for a couple of years to work in our beds. We've had a very wet winter so I'm curious how that's going to affect my hostas. It might also explain why they haven't done as well in the past. In the past several years we've had a drought. To compensate, I overwatered. (Yeah, I'm in dire need of some hosta education.) My soil tester has been misplaced so I have no idea what our ph is right now but I'll be getting another one tomorrow. Thanks again!
Brenda

JJ, Jake and Josie
Image
New Topic Post Reply