diff --git a/app/helpers/seed_filters_helper.rb b/app/helpers/seed_filters_helper.rb
index 6607e3089..26303df88 100644
--- a/app/helpers/seed_filters_helper.rb
+++ b/app/helpers/seed_filters_helper.rb
@@ -39,16 +39,30 @@ module SeedFiltersHelper
      ['Shared for trading', { shared: 1 }]]
   end
 
+  # "Sow now": this month, and next in the last days of it.
+  def seed_sow_now_label
+    "Sow now (#{Seed.sow_now_months.map { |month| Date::MONTHNAMES[month] }.join(' & ')})"
+  end
+
+  # Every month as a chip, for a screen wide enough to show them all.
+  def seed_month_chips
+    [['Any month', { sow_month: nil }],
+     [seed_sow_now_label, { sow_month: 'now' }],
+     *Date::MONTHNAMES.compact.each_with_index.map { |name, index| [name, { sow_month: index + 1 }] }]
+  end
+
   # The chips in their labelled groups. How far away only means something on
   # other people's seeds, and sharing only on a gardener's own: everyone's are
-  # all shared.
+  # all shared. The months are chips on a wide screen and a select on a narrow
+  # one, so that group says it is `wide_only`.
   def seed_filter_groups(everyone:)
-    [['Source', seed_source_chips],
+    [['Month to sow', seed_month_chips, true],
+     ['Source', seed_source_chips],
      (['Distance', seed_distance_chips] if everyone && current_member&.latitude),
      (['Sharing', seed_sharing_chips] unless everyone),
      ['Heirloom or hybrid', seed_heirloom_chips],
-     ['Planted', seed_planted_chips]].compact.map do |label, chips|
-      { label:, chips: chips.map { |chip_label, params| { label: chip_label, params: } } }
+     ['Planted', seed_planted_chips]].compact.map do |label, chips, wide_only|
+      { label:, wide_only: wide_only || false, chips: chips.map { |chip_label, params| { label: chip_label, params: } } }
     end
   end
 
diff --git a/app/helpers/seeds_helper.rb b/app/helpers/seeds_helper.rb
index 340a0dbb9..26b469f2b 100644
--- a/app/helpers/seeds_helper.rb
+++ b/app/helpers/seeds_helper.rb
@@ -182,7 +182,7 @@ module SeedsHelper
     {
       groups:      everyone ? SEED_GROUPS + [%w(gardener Gardener)] : SEED_GROUPS,
       filters:     seed_filter_groups(everyone:),
-      sow_now:     "Sow now (#{Seed.sow_now_months.map { |month| Date::MONTHNAMES[month] }.join(' & ')})",
+      sow_now:     seed_sow_now_label,
       gardeners:   (seed_friend_names if everyone),
       months:      Date::MONTHNAMES.compact.each_with_index.map { |name, index| [index + 1, name] },
       clear:       seed_filters_off.merge(crop: nil),
diff --git a/app/javascript/components/SeedLibrary.jsx b/app/javascript/components/SeedLibrary.jsx
index 851acb43d..ddb8a1325 100644
--- a/app/javascript/components/SeedLibrary.jsx
+++ b/app/javascript/components/SeedLibrary.jsx
@@ -181,7 +181,7 @@ export default function SeedLibrary({scope: initialScope, tabs: initialTabs, htm
             <Choice params={clear} search={pendingSearch} className="seed-clear" onChoose={show}>Clear all filters</Choice>
           )}
         </div>
-        <div className="seed-filter-row">
+        <div className="seed-filter-row d-lg-none">
           <div className="seed-field">
             <label className="seed-field-label" htmlFor="seed-month">Month to sow</label>
             <select
@@ -221,8 +221,8 @@ export default function SeedLibrary({scope: initialScope, tabs: initialTabs, htm
             </div>
           </div>
         )}
-        {filters.map(({label, chips}) => (
-          <div className="seed-filter-row" key={label}>
+        {filters.map(({label, chips, wide_only: wideOnly}) => (
+          <div className={`seed-filter-row${wideOnly ? ' d-none d-lg-flex' : ''}`} key={label}>
             <div className="seed-field">
               <span className="seed-field-label">{label}</span>
               <ul className="seed-chips">{chips.map(chip)}</ul>
diff --git a/app/javascript/components/SeedLibrary.test.jsx b/app/javascript/components/SeedLibrary.test.jsx
index cea53fba5..4566378b3 100644
--- a/app/javascript/components/SeedLibrary.test.jsx
+++ b/app/javascript/components/SeedLibrary.test.jsx
@@ -24,6 +24,11 @@ const props = {
       ],
     },
     {label: 'Planted', chips: [{label: 'Not planted yet', params: {planted: 'no'}}]},
+    {
+      label: 'Month to sow',
+      wide_only: true,
+      chips: [{label: 'Any month', params: {sow_month: null}}, {label: 'September', params: {sow_month: 9}}],
+    },
   ],
   months: [[1, 'January'], [9, 'September']],
   sow_now: 'Sow now (November)',
@@ -232,6 +237,21 @@ describe('SeedLibrary', () => {
       expect(screen.queryByLabelText('Gardener')).not.toBeInTheDocument();
     });
 
+    it('offers every month as a chip for a wide screen', () => {
+      setup();
+      expect(screen.getByRole('link', {name: 'September'})).toHaveAttribute('href', '/seeds?sow_month=9');
+    });
+
+    it('shows the month chips on wide screens only', () => {
+      setup();
+      expect(screen.getByRole('link', {name: 'September'}).closest('.seed-filter-row')).toHaveClass('d-none', 'd-lg-flex');
+    });
+
+    it('shows the month select on narrow screens only', () => {
+      setup();
+      expect(screen.getByLabelText('Month to sow').closest('.seed-filter-row')).toHaveClass('d-lg-none');
+    });
+
     it('keeps the filters in force when another is chosen', () => {
       window.history.replaceState({}, '', '/seeds?from=bought&group=year');
       setup();
diff --git a/spec/features/seeds/live_filters_spec.rb b/spec/features/seeds/live_filters_spec.rb
index 40ecf1144..788821ed8 100644
--- a/spec/features/seeds/live_filters_spec.rb
+++ b/spec/features/seeds/live_filters_spec.rb
@@ -57,6 +57,13 @@ describe "changing the seeds shown without reloading", :js do
     it { expect(page).to have_current_path member_seeds_path(owner) }
   end
 
+  context "when choosing a month" do
+    before { click_link 'September' }
+
+    it { expect(page).to have_seed_params(sow_month: 9) }
+    it { expect(page).to have_css('.seed-chip.active', text: 'September') }
+  end
+
   context "when choosing mine after choosing a chip" do
     include_context 'signed in member'
 
diff --git a/spec/features/seeds/removing_filters_spec.rb b/spec/features/seeds/removing_filters_spec.rb
index 574fc3579..b8a0a9e9f 100644
--- a/spec/features/seeds/removing_filters_spec.rb
+++ b/spec/features/seeds/removing_filters_spec.rb
@@ -36,7 +36,7 @@ describe "removing seed library filters", :js do
   end
 
   context "when choosing any sowing month" do
-    before { select 'Any month', from: 'Month to sow' }
+    before { click_link 'Any month' }
 
     it { expect(page).to have_seed_params(from: 'retail', heirloom: 'heirloom', planted: 'no', crop: tomato.slug, group: 'year') }
   end
diff --git a/spec/helpers/seed_filters_helper_spec.rb b/spec/helpers/seed_filters_helper_spec.rb
index 0dae3e8f8..f7a145478 100644
--- a/spec/helpers/seed_filters_helper_spec.rb
+++ b/spec/helpers/seed_filters_helper_spec.rb
@@ -3,6 +3,8 @@
 require 'rails_helper'
 
 describe SeedFiltersHelper do
+  include ActiveSupport::Testing::TimeHelpers
+
   describe '#seed_view_path' do
     before do
       allow(helper.request).to receive_messages(path: '/seeds', query_parameters: { 'from' => 'bought', 'page' => '3', 'utm' => 'x' })
@@ -50,21 +52,46 @@ describe SeedFiltersHelper do
     context 'with the member\'s own seeds' do
       let(:everyone) { false }
 
-      it { expect(groups.pluck(:label)).to eq ['Source', 'Sharing', 'Heirloom or hybrid', 'Planted'] }
+      it { expect(groups.pluck(:label)).to eq ['Month to sow', 'Source', 'Sharing', 'Heirloom or hybrid', 'Planted'] }
     end
 
     context 'with everyone\'s seeds' do
       let(:everyone) { true }
+      let(:distance) { groups.find { |group| group[:label] == 'Distance' }[:chips] }
 
-      it { expect(groups.pluck(:label)).to eq ['Source', 'Distance', 'Heirloom or hybrid', 'Planted'] }
-      it { expect(groups.second[:chips].pluck(:label)).to eq ['Anywhere', 'Within 50 km', 'Within 10 km'] }
+      it { expect(groups.pluck(:label)).to eq ['Month to sow', 'Source', 'Distance', 'Heirloom or hybrid', 'Planted'] }
+      it { expect(distance.pluck(:label)).to eq ['Anywhere', 'Within 50 km', 'Within 10 km'] }
     end
 
     context 'with everyone\'s seeds when signed out' do
       let(:everyone) { true }
       let(:viewer) { nil }
 
-      it { expect(groups.pluck(:label)).to eq ['Source', 'Heirloom or hybrid', 'Planted'] }
+      it { expect(groups.pluck(:label)).to eq ['Month to sow', 'Source', 'Heirloom or hybrid', 'Planted'] }
+    end
+  end
+
+  describe 'month chips' do
+    let(:chips) { helper.seed_month_chips }
+
+    before { travel_to Date.new(2026, 11, 4) }
+
+    it { expect(chips.first.first).to eq 'Any month' }
+    it { expect(chips.second.first).to eq 'Sow now (November)' }
+    it { expect(chips.second.last).to eq(sow_month: 'now') }
+    it { expect(chips.size).to eq 14 }
+    it { expect(chips.assoc('September').last).to eq(sow_month: 9) }
+    it { expect(helper.seed_filter_groups(everyone: false).first[:wide_only]).to be true }
+    it { expect(helper.seed_filter_groups(everyone: false).second[:wide_only]).to be false }
+  end
+
+  describe '#seed_sow_now_label' do
+    it 'names this month early in it' do
+      travel_to(Date.new(2026, 11, 4)) { expect(helper.seed_sow_now_label).to eq 'Sow now (November)' }
+    end
+
+    it 'names next month too near the end of this one' do
+      travel_to(Date.new(2026, 11, 28)) { expect(helper.seed_sow_now_label).to eq 'Sow now (November & December)' }
     end
   end
 end